"BRB" stands for "Be Right Back," a common abbreviation used in digital communication. It indicates that a person will temporarily leave a conversation or online activity but intends to return shortly. This phrase is often used in text messages, chat rooms, and social media platforms to inform others that the user is stepping away for a brief period. The use of "BRB" is part of a broader trend in online communication where abbreviations and acronyms, like LOL (Laugh Out Loud) and TTYL (Talk To You Later), help convey messages quickly. These shorthand expressions have become integral to modern digital interactions, making conversations more efficient.