What web scraping is
Web scraping is the automated collection of data from websites using software rather than copying it by hand. A program, often called a scraper or bot, loads a web page, reads its underlying code, and pulls out the specific pieces of information it wants, such as prices, headlines, or contact details. It then saves that data in a structured form like a spreadsheet or database, ready to be sorted, searched, or analyzed.
How it works
A scraper usually fetches a page's HTML, the markup that describes its content, then parses that markup to find the parts it needs by their tags, classes, or positions. Simple scrapers read the raw HTML directly. Sites that build their content with JavaScript may require a headless browser, a browser without a visible window, that runs the page's scripts first so the full content appears before the scraper reads it.
What it is used for
Web scraping has many legitimate uses. Price-comparison sites gather product listings from many shops, researchers collect public data for studies, and search engines crawl pages to build their indexes. Businesses monitor competitors, track reviews, or aggregate job postings. Because so much useful information lives on web pages without a convenient download option, scraping is often the only practical way to gather it at scale.
Scraping versus APIs
When a website offers an API, an official interface for requesting its data, using it is almost always better than scraping. An API returns clean, structured data and is far less likely to break. Scraping depends on a page's layout, so a redesign can stop a scraper working overnight. Scraping is the fallback for the many sites that provide no API, trading reliability for the ability to reach data that is otherwise locked in pages.
Legal and ethical limits
Scraping sits in a complex legal and ethical area. Many sites set rules in a file called robots.txt and in their terms of service, and good practice is to respect them, avoid collecting personal or copyrighted data, and not overload a server with rapid requests. The law varies by country and case, so scraping public data responsibly is very different from ignoring a site's wishes or harvesting private information.
The bottom line
Web scraping uses software to pull data out of web pages automatically, turning scattered online information into structured data you can work with. It powers price comparisons, research, and search engines, but it is more fragile than using an API and comes with real legal and ethical limits. Done carefully and respectfully, it is a powerful way to gather information that has no other easy export.
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See also: What is an API? Explained simply, What is tree shaking? Explained.
Sources
Published date reflects the original event date (2026-10-23). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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