Can someone please explain .Unit to me as well as it's application?

The topic is quite self explanatory, I am really confused about .unit and it's application, any roblox developer articles links would work too.

It normalizes the vector so that it has a magnitude of one. Say I wanted to get the direction from part1 to part2; I can do so by subtracting part1's position from part2's position, and getting the unit of that. An example use of the direction would be to move part1 five studs toward part2.

--Remember to make sure Part1 and Part2 are both valid parts in workspace and both anchored for this example to work.

local part1, part2 = workspace.Part1, workspace.Part2

local direction = (part2.Position - part1.Position).Unit
part1.CFrame += direction * 5

https://developer.roblox.com/en-us/api-reference/datatype/Vector3