File types (often distinguished by their extension, like .pdf or .jpg) dictate how your computer’s operating system should store, open, and display data. They tell your system which application to use and are generally broken down into several major categories:
Documents: Formats like .pdf (Portable Document Format) for sharing read-only layouts, .docx for Microsoft Word, and .txt for plain, unformatted text.
Images: Visual formats that include .jpg/.jpeg (lossy, compressed photos), .png (lossless, great for transparency), and .svg (vector graphics for scalable logos).
Video/Audio: Media formats such as .mp4 (standard video container), .mp3 (compressed audio), and .wav (uncompressed audio).
Compressed Archives: File-bundling types like .zip (combines multiple files into one smaller download) and .rar.
Because there are thousands of different file formats, they all have a unique “signature” or “magic number” hidden within the first few bytes of the file’s data. Even if you accidentally delete or misname a file extension, your computer often uses this internal signature to figure out exactly what it is. YouTube·Ask Leo!
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