Logs

$ /var/log
directory containing files and folders containing logging info for applications and services running on your system
services and logs help you monitor the health of your system
applications and services such as
an Appache2 webserver - hosting webpages
fail2ban service- monitors brute force attemtps
UFW service - firewall
services and logs help you monitor the health of your system
logs for web server contain info about every single request- alllows developers/admins to diagnose performance issues/ investigate intruders activity

2 types of log files - Access log and Error log