Fájlkiterjesztéseknek

Fájlkiterjesztéseknek, often translated as "file extensions," are suffixes added to the end of a filename. These extensions are crucial for operating systems and applications to identify the type of data contained within a file and determine which program should be used to open and interpret it. For example, a file named "document.txt" has the extension ".txt," indicating it is a plain text file that can be opened by a text editor. Similarly, "image.jpg" uses the ".jpg" extension to signal that it's a JPEG image file, typically opened by an image viewer or editor.

The use of file extensions is a common convention across various operating systems, including Windows, macOS, and Linux, although the exact set of recognized extensions can differ. Extensions are usually separated from the base filename by a period (.). While most common file types have widely recognized extensions, custom or proprietary applications may use their own unique extensions.

Operating systems often associate specific applications with particular file extensions. When a user double-clicks a file, the operating system looks at the extension and launches the default program configured for that file type. This automatic association simplifies file management and usage for end-users. However, it's important to note that file extensions are merely labels; they do not inherently dictate the file's actual content. Malicious actors can sometimes rename a file with an extension that suggests it is safe, when in reality it contains harmful code. Therefore, users should exercise caution when opening files from untrusted sources, regardless of their extensions.