LLMs are the technology behind tools like ChatGPT, Claude, and Gemini. They work by predicting what text should come next based on patterns learned during training — which makes them capable of drafting job descriptions, answering candidate questions, summarizing resumes, and generating interview guides. In hiring, LLMs are increasingly embedded in applicant tracking software, AI recruiting tools, and communication automation. Understanding how they work helps hiring teams use them effectively and catch the cases where they fall short, like producing confident-sounding outputs that are factually wrong or subtly biased.