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A web crawler is a digital search engine bot that uses copy and metadata to discover and index site pages. Also referred to as a spider bot, it "crawls" the world wide web (hence "spider" and "crawler") to learn what a given page is about. It then indexes the pages and stores the information for future searches.
Web crawling works by discovering new pages, indexing them, and then storing the information for future use. It can continuously crawl your content at specified intervals to keep your search results updated and searchable.
Web crawling starts with discovering new pages by using seed URLs, fetching their content via HTTP requests, and parsing HTML to extract and queue new hyperlinks
Indexing involves extracting data from fetched pages, storing it in a database, and organizing it into a searchable index with relevant metadata
The rinse and repeat cycle continuously fetches new or updated content, respects crawling rules, updates the URL queue, and revisits URLs to keep the index current and accurate
By automating the process of collecting and indexing information, web crawlers enable the efficient handling of vast amounts of data across the internet, making this information accessible and usable.
This is particularly essential for businesses that rely on being found via search engines by potential customersIt can continuously crawl your content at specified intervals
User satisfaction benefits from web crawling as it enhances the relevance and quality of search results. Advanced crawling techniques allow search engines to better understand website content and improves user experience
Web crawling automates the data collection and analysis process, allowing for real-time monitoring and updates across various applications, such as price monitoring and digital marketing
Web crawlers can be programmed to fulfill different tasks. As such, different types of web crawlers exist.
A focused web crawler, is designed to gather web pages that are relevant to a specific topic or set of topics. Unlike general web crawlers that index everything they find, focused crawlers prioritize content based on its relevance to the predefined topics
An incremental web crawler is designed to keep its index updated by frequently revisiting web pages to check for new changes. It aims to minimize the resources used by focusing on parts of the web that change frequently and adjusting its crawl strategy based on the observed change rates of web pages
A distributed web crawler uses a network of machines to perform crawling tasks, distributing the workload across many computers either on the same network or across locations
A parallel crawler operates similarly to distributed crawlers but focuses on executing multiple crawl processes simultaneously on the same machine or across different machines
While web crawling used by search engines provides a user-friendly search experience, business users benefit from web crawling in a number of ways.
Most web crawlers possess reporting or analytics features you can access. These reports can often be exported into spreadsheets or other readable formats and are helpful tools for managing your SEO and search strategy.
As a site manager, you can set crawl rate frequency rules. You decide how often the spider bot crawls your site. Because the bot is automated, there is no need to manually pull crawl reports every time.
Using a web crawler on your site enables you to index your data automatically. You can control what data gets crawled and indexed, further automating the process.
Crawling can help you gather insights on the market, find opportunities within and generate leads. As an automatic search tool, it speeds up a process that might otherwise be manual.
