two meanings. 1) not only...but also... "but also" means 而且 "not only" means 不但 2) besides. look at another your question about 再说 you can replace 再说 by 而且 there: 再说/而且，我舅舅就住在那儿。

there's a form in english :not only but also , 而且=but also not only =不仅 so here comes 不仅......而且/还....... 而且 is used to connect two sentence 她不仅漂亮 而且/还 聪明 she's not only pretty but also smart

而且 = also, in addition

而且 is somewhat similar to"and",is used to connect two sentences. There is a phrase in English"not only ... but also...", but also means 而且.