LFI (Local File Inclution)

The method of including files that are already locally present on the server (also referred to as Local File Inclusion) involves leveraging susceptible inclusion mechanisms implemented in the web application.
The path to the file that needs to be included is received as input by a page, and if this input is not properly validated or sanitized, characters such as dot-dot-slash (for directory traversal) can be injected and malicious activities can be performed.