What is the tl;dr of the tool? How does it differ from the description of its category, Text Editor?
Vim is a text editor that focuses on quick and powerful editing. This is achieved through separate modes of keyboard operation: one for inserting text, and two for editing and jumping around the text that goes beyond using the arrow keys or mouse.
Why use this tool over an alternative?
Productivity can greatly increase once a user is comfortable with the program, it's available on nearly every Linux installation by default, and its plugin ecosystem provides additional flexibility for various tasks.