Sentence:  Now streamers can use a new feature that lets their viewers join a <WSD>raid</WSD> then drive traffic to another streamer with just a click. 
Meaning of the word marked with <WSD> tags:  An activity initiated at or towards the end of a live broadcast by the broadcaster that sends its viewers to a different broadcast, primarily intended to boost the viewership of the receiving broadcaster. This is frequently accompanied by a message in the form of a hashtag that is posted in the broadcast's chat by the viewers.