Why can some Kanji be written multiple ways?

Recently got confused seeing this kanji I knew from 注意 written in a different way as shown above. The stroke on the bottom left looks so different I thought it was a whole different kanji at first. Is this just different font styles like we see in English typefaces? It got me thinking about how many different kanji fonts there could possibly be, and then my brain started hurting…

by chagis100