In Biology we're going to focus on two types of bonds, ionic bonds and covalent. Covalent bonds can be classified as nonpolar covalent bonds and polar covalent bonds.  

This video gives a good explanation of  ionic, polar covalent, and nonpolar covalent bonds. https://youtu.be/7DjsD7Hcd9U 

Use this animation to review Atoms and Bonding