A coordinate shows where something is on a grid.
The first part of the coordinate tells you how far along to go.
The second part tells you how far up to go.
One way to remember it is by saying:
'along the corridor and up the stairs'
Coordinates always go in brackets and are separated by a comma.
The coordinates of A are (3, 1)
The coordinates of C are (3, 6)
We can also plot points on a grid if we are given their coordinates.