Preencha os espaços em branco para completar o texto.
User of an online chatroom need to be present at the same time in order to take part. Users of an online forum do not need to be present at the same time in order to take part.
Explain this by giving one benefit for each.
An online means that can chat (real time) like a
A is where users can leave so other can access the message when it is for them.