.txt is a filename extension for files consisting of text with very little formatting (ex: no '''bolding''' or ''italics''). This kind of text format is also called a plain text file to differentiate them from other kinds of binary file, which, at the time the distinction was made, were not supposed to have human readable text. The precise definition of the .txt format is not specified, but typically matches the format accepted by the system term...
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.txt is a filename extension for files consisting of text with very little formatting (ex: no '''bolding''' or ''italics''). This kind of text format is also called a plain text file to differentiate them from other kinds of binary file, which, at the time the distinction was made, were not supposed to have human readable text. The precise definition of the .txt format is not specified, but typically matches the format accepted by the system terminal or simple text editor. Files with the .txt extension can easily be read or opened by any program that reads text and, for that reason, are considered universal (or platform independent).
It should be noted that not all systems use the .txt extension when creating plain text files. In particular, on Unix systems, where extensions are entirely optional, it's common to see text files with no extension at all, the most prominent example being the file, present in many software packages. However, there's no difference between a plain text...
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