A rotation is what occurs when we turn an object or shape around a central point. The object is exactly the same shape and size, just spun around (like going in a circle). Every point on the original shape has a matching point on the new shape.

Commonly we describe rotations using a degree measure (like an angle), and as being either clockwise or anticlockwise.

Particularly at the moment you need to be able to identify rotations of:

$90^\circ$90° (a quarter turn), $180^\circ$180° (a half turn), $270^\circ$270° (a three-quarter turn) and $360^\circ$360° (a full turn) in both clockwise and anticlockwise directions.

Have a play with this interactive. Here you can change the shape that of the object and the position of the central rotation point. Notice how a rotation of $360^\circ$360° takes you right back to where you started.