What's the Difference Between a Physical and Chemical Sunscreen?

What's the difference between a chemical and physical sunscreen? Well how they work to protect the skin for UV damage and what they mean for your body in general. 

Chemicals mentioned: avobenzone, oxtinoxate, oxybenzone, homosalate
Physical ingredients: zinc oxide, titanium dioxide

My current facial sunscreen: Pai British Summer Time 
My body/kids sunscreen: Babo Botanicals 

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