what does the 2nd "part" represent in this script and what does the first one represent?

I'm making a script that will make npc's move from 1 position to the next one but I don't understand what the first part and 2nd part represent in this script? the npc moves to the first position but not the 2nd one

here's my script

local part = game.Workspace.Part
game.Players.LocalPlayer.Character.Humanoid:MoveTo(part.Position, part)

The local part is the one that is the variable.