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The client-side and server-side refer to two distinct parts of a web application that work together to deliver functionality to users. Understanding their roles is essential for building efficient and responsive applications.
Client-Side
- What it Does: This is the part of the application that runs in the user’s browser. It handles user interfaces and interactions, allowing users to see and interact with the application.
- Key Characteristics:
- Executes JavaScript code directly in the browser to handle tasks like form validation, animations, and dynamic content updates (through DOM -Document Object Model- updates).
- Manages rendering of HTML and CSS for a seamless visual experience.
- Often communicates with the server via REST (Representational State Transfer) APIs to fetch or send data asynchronously.
- Examples:
- Clicking a button that triggers a JavaScript function to show a popup.
- Fetching additional items on a page using
fetch()oraxioswithout a full page reload.
Server-Side
- What it Does: This part operates on the server and processes requests from the client, performing tasks like database queries, business logic, and serving responses.
- Key Characteristics:
- Executes server-side programming languages like Python, Java, or Node.js.
- Handles sensitive operations like authentication and data storage securely.
- Sends data to the client in structured formats (e.g., JSON) via REST APIs for rendering.
- Examples:
- Processing a login request by verifying credentials in a database.
- Returning a list of products in JSON format for the client to display dynamically.