'splash page' means: the first page of a website.
A lot of times, the splash page will have some kind of animated picture.
It kind of looks like paint splashing. That's where the expression comes from.
http://www.herostratus.ca/
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog
