>i prefer to just make my site in some sort of pagebuilder
Even easier. A page builder should have a function that lets you insert a rollover without even touching the code. Unless it's a super cheap builder provided by a free web host.

In that case you'll pretty much have to get your hands a little dirty.
>html code(or is it javascript)
It's both. a href and img src are HTML tags. The onMouseOver and onMouseOut events and properties are Javascript.
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