Log rotation, a normal thing on Linux systems, keeps any particular log file from becoming too large, yet ensures that sufficient details on system activities are still available for proper system monitoring and troubleshooting.
The oldest in a group of log files is removed, remaining log files are bumped down a notch and a newer file takes its place as the current log file. This process is conveniently automated and the details can be adjusted as needed.
Manual rotation of log files is possible through the use of the logrotate command. This post provides details on how to manually rotate log files and what to expect.
Thanks to Sandra Henry-Stocker (see source)