A content type (also known as a MIME type or media type) is a standardized way for computers to identify the nature and format of a file or data stream being transmitted.
In the context of web development and the Internet, it is primarily used in HTTP headers to tell a browser or server how to process and display information. How it Works
When a server sends a file (like an image or a webpage) to your browser, it includes a Content-Type header.
Without it: The browser might try to guess the format (a process called “sniffing”), which can lead to errors or security risks.
With it: The browser immediately knows, for example, to render a file as a webpage (text/html) or as an image (image/png). Standard Format Content-Type header – HTTP – MDN Web Docs – Mozilla
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