What are the different swimming styles? Which one is the fastest and which one the slowest?
There are four main different swimming styles in competitive swimming. These are backstroke, breaststroke, butterfly and crawl.

Crawl is the fastest style, while breaststroke is considered to be the slowest.
Quais são os diferentes estilos de natação? Qual é a mais rápida e qual a mais lenta?
Existem quatro estilos de natação diferentes na natação competitiva: de costas, de peito, borboleta e crawl.