The file is a specific recovery image used to install Team Win Recovery Project (TWRP) version 3.0.0-0 on the Samsung Galaxy Tab 2 10.1 (3G + WiFi) , model GT-P5100 .
It seems you've stumbled upon a file with a rather specific and technical name: gt-p5100-twrp-3.0.0-0.tar.md5 . Let's break down what each part of this filename typically represents, as it relates to the world of Android devices and custom recovery: gt-p5100-twrp-3.0.0-0.tar.md5