Web scraping is a technique used to extract information from websites automatically. A web scraping tool is a software program that can do this task for you, without requiring you to manually visit and copy data from each website.

The tool typically works by sending a request to a website and then parsing the HTML or other code to extract the data you need. Depending on the tool, you can extract data such as product prices, customer reviews, news articles, job postings, or any other information that can be found on websites.