Imagine you have a pair of shoes that make you taller. These shoes have a very thick, flat sole like a pancake that goes through the entire bottom of the shoe. This big, flat sole is called a platform. It's like a mini-platform that you stand on top of that makes you a little taller than you really are.
Platform shoes were once very popular in the 70s and 90s, especially for grown-ups. People wore them to look taller and more fashionable. Nowadays, some people still like to wear platform shoes because they help give you a boost and make you look trendy. But remember to be careful and not to trip over your big shoes!