Answer:
*You could just look it up.
Here's what I found on google:
Two figures are said to be similar if they are the same shape. In more mathematical language, two figures are similar if their corresponding angles are congruent, and the ratios of the lengths of their corresponding sides are equal. This common ratio is called the scale factor.
So basically, similar figures are 2 figures that are the same shape.
They don't have to be the same size.