In one sentence
Claude-Web (also known as ClaudeBot) is a Claude-specific Web crawler operated by Anthropic. When Claude generates answers through its Web search feature, it gathers your site's information as a citation candidate.
What does it look like in practice?
When someone asks Claude "tell me about XX" in a specialist or B2B domain, the answer is assembled using sources Claude-Web has previously crawled.
Claude has strengths in long-form, specialist, and accurate output, and is increasingly used by B2B sales reps and consultants for research. Being cited by Claude means exposure to purchase decision-makers.