Because the phrase “content type” means completely different things depending on your industry, it is best looked at through its three most common contexts: web development (HTTP headers), content management systems (CMS), and digital marketing. 1. Web Development & Networking (HTTP Headers)
In web development, Content-Type is a vital HTTP response and request header used to tell web browsers or servers exactly what kind of data is being transmitted. This is also known as a MIME type or Media type.
Without this header, a browser wouldn’t know whether to display a file as a web page, download it as a PDF, or run it as music. Content-Type header – HTTP – MDN Web Docs – Mozilla
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