What is the significance of the number 10 in the tail command?

In the tail command, the number 10 typically signifies the number of lines to display from the end of a file. For example, when you run tail -n 10 filename.txt, it will show the last 10 lines of the specified file. If you simply use tail filename.txt, it defaults to displaying the last 10 lines as well. This is useful for quickly viewing the most recent entries in log files or any text files.