Web crawler is an automated program used to obtain information from the Internet. It can simulate the behavior of human users, visit web pages and extract needed data. The development of web crawler has gone through the following stages: 1. Early days: Early web crawlers were mainly used for the construction of search engines. By traversing the links on the Internet, they download the contents of web pages to the local area for indexing and searching. These crawlers mainly focus on the text content of web pages, but can't deal with complex web page structures and dynamic pages. 2. Mid-term stage: With the development of Internet, the content and structure of web pages are becoming more and more complicated. In order to cope with this change, web crawler began to introduce some technologies, such as JavaScript parsing and dynamic page rendering. This enables the crawler to process more types of web pages and extract more data. 3. Modern stage: Modern web crawler is more powerful and intelligent. They can handle complex web page structures and dynamic pages, and can automatically identify and extract the required data. Modern reptiles can also analyze and process the collected data through machine learning and natural language processing. As a modern web crawler tool, octopus collector has powerful functions and intelligent characteristics. It can help users collect data on the Internet quickly and efficiently, and provide rich data processing and analysis functions. Octopus has prepared a series of concise and easy-to-understand tutorials for users to help them quickly master the collection skills and easily cope with the data collection of various websites. Please go to official website to get a tutorial to help you learn more details.