what does "this" mean

I was looking through projects and I saw a lot of the word this being reused and I was wondering what it was cause I've never used it, I tried looking for it in documentation and didn't find it.

'This' is usually used in classes.

Whenever you create a new object it will turn 'this' into the name of the object.

For example if the object name is blob1 then 'this.x' will now be 'blob1.x'

example:

blob = class
  constructor = function(x,y)
    this.x = x //<---- See this.x 
    this.y = y
  end
  follow = function()
   screen.fillRect(this.x,this.y,20,20,"rgb(0,255,0)")
    for i=1 to 10 
      if mouse.x > this.x then 
        this.x = this.x + 1 
      elsif mouse.x < this.x then 
          this.x = this.x - 1 
      end
      if mouse.y > this.y then 
        this.y = this.y + 1 
      elsif mouse.y < this.y then 
          this.y = this.y - 1 
      end
    end
  end
  display = function()
    screen.fillRect(this.x,this.y,20,20,"rgb(0,255,0)")
  end
end