API (Application Programming Interface)
An API (Application Programming Interface) is a set of rules that allows different software applications to communicate and exchange data with each other. It acts as a bridge between systems, enabling one application to request services or information from another in a structured way.
- APIs help different applications connect and work together smoothly.
- They allow data sharing and communication without exposing internal system logic.
- APIs are widely used in web applications, mobile apps, payment systems, and cloud services.
Example: A mobile banking app requests account details through an API. The API verifies the request, fetches data from the banking server, and returns the account information to the app.
This is exactly how APIs work in software the API takes a request, sends it to the server, retrieves the data, and returns the response.
Most Important APIs
The most important APIs in HTML/JavaScript development are.
- The DOM API for HTML and XML documents
- The Fetch API for networking
- The Web Storage API for client-side data These APIs are fundamental to nearly all modern web development.
The DOM API
The DOM (Document Object Model) is the core API for HTML and XML documents. It provides a structured representation of a webpage, allowing JavaScript to access and manipulate elements, attributes, and content dynamically, creating interactive user interfaces.
The Fetch API
The modern standard for making network requests to servers and retrieving resources (like data from a database or a third-party service). It provides a more robust and flexible alternative to older methods like XMLHttpRequest.
Web Storage API
Offers mechanisms (localStorage and sessionStorage) to store key/value pairs of data in the browser more intuitively than cookies, allowing data to persist across sessions or page reloads.
References
https://www.w3schools.com/js/js_api_intro.asp
https://www.geeksforgeeks.org/software-testing/what-is-an-api/
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