The front part of the leg below the knee and above the foot.
Shins are the part of the leg that can hurt a lot if you bump them.
Examples:
He bumped his shins on the table.
She kicked the ball with her shins.
The little boy has a bruise on his shins.
I always seem to bump my shins on that chair!
Her shins hurt after she bumped them on the edge of the bed.
He wears special guards to protect his shins when he plays soccer.