Rashida Tlaib censured by Congress. What does censure mean?

In bipartisan fashion, the House of Representatives voted to censure Michigan's Democratic Rep. Rashida Tlaib as she continued to defend comments widely considered as calling for Israel's elimination. 

Twenty-two Democrats joined Republicans in a 234-188 vote late Tuesday, after Tlaib — the only Palestinian-American member of Congress — posted a video of Michigan protesters chanting "from the river to the sea," part of a chant condemned by Jewish groups and the Anti-Defamation Legue as antisemitic. 

But what does it mean to be censured in the House of Representatives and what effect does it have?