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Definition

Uniform Resource Identifier (URI)

A string of characters that uniquely identifies a resource on the internet.

Definition

URL

A Uniform Resource Locator (URL) is a specific type of URI that provides the address of a resource and how to access it.

Note

All URLs are URIs, but not all URIs are URLs.

Characteristics of URIs

Uniqueness:
1. Each URI is unique, ensuring that it identifies only one resource.
2. This uniqueness is crucial for avoiding confusion and ensuring accurate resource retrieval.
Scheme:
1. The scheme specifies the protocol used to access the resource, such as http , https , ftp , or mailto.
Flexibility:
1. URIs can identify resources in various ways, including by location (URL) or by name (URN).
Syntax:
1. URIs follow a specific syntax defined by standards like RFC 3986.
2. This ensures consistency and interoperability across different systems.

Example

mailto:info@example.com

This URI identifies an email address using the mailto scheme.

Characteristics of URLs

Location-Based:
1. URLs provide the exact location of a resource, such as a web page or file.
Components:
1. A URL consists of several components, including the scheme, host, path, and optional query parameters.
Accessibility:
1. URLs not only identify a resource but also provide the information needed to access it, such as the protocol and server address.
Human-Readable:
1. URLs are designed to be easily readable and understandable by humans, making them user-friendly.

Example

https://www.example.com/page?user=123

This URL specifies the https scheme, the host www.example.com , the path /page , and a query parameter user=123.

Differences Between URIs and URLs

Scope:
1. URIs are a broader concept that includes URLs and URNs.
2. URLs are a subset of URIs focused on location-based identification.
Functionality:
1. URIs can identify resources by name or location.
2. URLs specifically provide the address and access method for a resource.

Example

A URI could be urn:isbn:0451450523 (a book identifier), while a URL could be https://www.example.com (a web address).

What is a Uniform Resource Identifier (URI)?

Note

Introduction to URIs

A Uniform Resource Identifier (URI) is a string of characters that uniquely identifies a resource on the internet.

URIs are used to identify resources such as web pages, images, videos, and more.
They provide a standard way to refer to resources across different systems and platforms.

AnalogyThink of a URI as a unique identifier for a book in a library catalog. It tells you exactly which book you're looking for, regardless of where it is located.

ExampleA URI could be

https://www.example.com
mailto:info@example.com
urn:isbn:0451450523

DefinitionUniform Resource Identifier (URI)A string of characters that uniquely identifies a resource on the internet.

Definition

Uniform Resource Identifier (URI)

A string of characters that uniquely identifies a resource on the internet.

Definition

URL

A Uniform Resource Locator (URL) is a specific type of URI that provides the address of a resource and how to access it.

Note

All URLs are URIs, but not all URIs are URLs.

Characteristics of URIs

Uniqueness:
1. Each URI is unique, ensuring that it identifies only one resource.
2. This uniqueness is crucial for avoiding confusion and ensuring accurate resource retrieval.
Scheme:
1. The scheme specifies the protocol used to access the resource, such as http , https , ftp , or mailto.
Flexibility:
1. URIs can identify resources in various ways, including by location (URL) or by name (URN).
Syntax:
1. URIs follow a specific syntax defined by standards like RFC 3986.
2. This ensures consistency and interoperability across different systems.

Example

mailto:info@example.com

This URI identifies an email address using the mailto scheme.

Characteristics of URLs

Location-Based:
1. URLs provide the exact location of a resource, such as a web page or file.
Components:
1. A URL consists of several components, including the scheme, host, path, and optional query parameters.
Accessibility:
1. URLs not only identify a resource but also provide the information needed to access it, such as the protocol and server address.
Human-Readable:
1. URLs are designed to be easily readable and understandable by humans, making them user-friendly.

Example

https://www.example.com/page?user=123

This URL specifies the https scheme, the host www.example.com , the path /page , and a query parameter user=123.

Differences Between URIs and URLs

Scope:
1. URIs are a broader concept that includes URLs and URNs.
2. URLs are a subset of URIs focused on location-based identification.
Functionality:
1. URIs can identify resources by name or location.
2. URLs specifically provide the address and access method for a resource.

Example

A URI could be urn:isbn:0451450523 (a book identifier), while a URL could be https://www.example.com (a web address).

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Note

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Hint

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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What is a Uniform Resource Identifier (URI)?

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Note

Introduction to URIs

A Uniform Resource Identifier (URI) is a string of characters that uniquely identifies a resource on the internet.

URIs are used to identify resources such as web pages, images, videos, and more.
They provide a standard way to refer to resources across different systems and platforms.

AnalogyThink of a URI as a unique identifier for a book in a library catalog. It tells you exactly which book you're looking for, regardless of where it is located.

ExampleA URI could be

https://www.example.com
mailto:info@example.com
urn:isbn:0451450523

DefinitionUniform Resource Identifier (URI)A string of characters that uniquely identifies a resource on the internet.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

C.1.4 Uniform Resource Identifier and URL Notes

Characteristics of URIs

Characteristics of URLs

Differences Between URIs and URLs

Introduction to URIs

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

Characteristics of URIs

Characteristics of URLs

Differences Between URIs and URLs

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anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Introduction to URIs

Unlock the rest of this chapter with a Free account

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident