Crawling

Technical terms
About 1 min read

An automation technology where bots navigate the internet, discover web pages, and collect information. Beyond simple data extraction, it is a core process that serves as the foundation for search engine indexing or building large-scale datasets for AI model training.

Also known as
CrawlingWeb crawlingScrapingWeb Scraping

Detailed explanation

Crawling is the process in which web crawlers (bots) systematically visit websites by following hyperlinks to collect content. Recently, beyond simple HTML parsing, utilizing headless browsers like Playwright or Puppeteer to render and collect JavaScript-based dynamic content has become the standard. Especially in the era of generative AI, its importance has grown further, with bots like GPTBot and ClaudeBot securing large-scale data for LLM training or acting as real-time information sources for RAG (Retrieval-Augmented Generation) technology. When collecting at a large scale, rate limiting to manage server load and compliance with protocols like robots.txt and llms.txt are essential.

Why it matters in tool selection

While traditional crawlers focused on static text, 'JavaScript rendering capability' and 'semantic analysis' functions are key when selecting modern AI tools. Choosing tools that include features allowing AI to understand the content and convert it into an easily processable format—beyond simple collection—will reduce data refining costs.

Checklist for operating AI crawlers

  • Compliance with robots.txt and the latest protocols (llms.txt)
  • Support for JavaScript execution and dynamic content rendering
  • Proxy rotation and rate limiting features to prevent IP blocking
  • Integration capability with real-time RAG (Retrieval-Augmented Generation) pipelines for the collected data

Representative cases

1. Search Engines: Googlebot visits and indexes billions of pages daily. 2. AI Training: Common Crawl crawls the entire web to provide training datasets for models like GPT-4. 3. Real-time AI Assistants: Crawling and summarizing recent news sites to answer user queries.

Commonly confused terms

Crawling

The act of 'visiting' web pages to collect the overall structure and links (URL-focused)

Scraping

The act of extracting only the 'necessary data (prices, titles, etc.)' from a collected specific page (data-focused)

Related terms

RAG