.log — Log File
Text text/plain
What a .log file is
Plain text output from an application or system, usually one timestamped event per line.
How to open it
Any text editor. For large files use tail -f, less, or ripgrep rather than opening the whole thing.
Worth knowing
Log files grow without bound unless rotated. A full disk from unrotated logs is a classic 3 a.m. incident.