AI research tools answer questions and gather knowledge by searching across sources and synthesizing what they find into a clear, cited reply. You ask in plain language and get back a sourced summary instead of a list of links to read yourself. The category includes answer engines like Perplexity, reasoning assistants like Claude and DeepSeek, and specialized tools like WarrenAI for financial questions.
This is general research, the kind you do when you need to understand a topic quickly, not the academic-paper work covered by the Research Paper category next door. People use these tools to get up to speed on a subject, fact-check a claim, or pull together background before a meeting. The single most important feature is whether the tool cites its sources, because that lets you verify an answer instead of trusting it on faith. Treat the response as a fast, well-organized starting point, then click through to confirm anything that actually matters.