A task where a system directly answers questions written in everyday language.
QA is the friend who answers the actual question. Ask about rain, and it skips the whole weather lecture.
It turns normal questions into direct answers. You meet it in search and support chats. Company help pages use it too.
NLP
Question Answering is one of the classic tasks in NLP.
IR
Open-domain QA often searches for sources first, then builds an answer.
RAG
RAG connects search with generation for modern QA systems.
LLM
LLMs let QA write answers, not just copy sentences.