When managing your website files, you'll encounter various file extensions that determine how content is processed. Extensions are the suffixes after the dot in filenames (like .html, .php, or .jpg) that tell servers and browsers what type of file they're handling.

Common extensions include:

• .html/.htm - Static web pages
• .php - Dynamic server-side scripts
• .css - Style sheets for design
• .js - JavaScript functionality
• .jpg/.png/.gif - Image formats

Your hosting environment must support specific extensions for corresponding functions. For example, PHP files require PHP support on the server. Important: Always use correct extensions - naming a PHP file as .html will cause the code to display as text rather than execute.

To check supported extensions, consult your hosting control panel or documentation. Most modern hosts support standard web extensions, but some specialized ones (like .asp for Windows servers) may require specific hosting plans.

When uploading files via FTP or file manager, maintain original extensions. Changing them improperly can break your website functionality. If you need to modify how extensions are handled (like making HTML files process as PHP), use .htaccess rules carefully.

Understanding extensions helps you troubleshoot issues, organize content effectively, and ensure your website components work together seamlessly.