Hello, I am Yuechuang.
The Internet was born to make it easier for people to share data and exchange communications. The Internet is a bridge connecting people all over the world. Clicking and browsing of the website are all artificial, and the people chatting with you are also real people.
However, with the development of technology and people’s desire for data, various network robots have appeared. At this time, you don’t know whether the person chatting with you on the other side of the screen is a person or a dog, and you don’t know the number of views of your website. It was a person who clicked it or a machine crawled it out.
On the surface, there are all kinds of people on the Internet; secretly, there are all kinds of web crawlers.
Before I talk about what crawlers are, let me talk about the position of crawlers. This is also one of the original intentions of many students who sign up for my crawler private lessons.
1. Crawler jobs in the era of big data
The above picture data is to increase everyone's interest in learning web crawlers. It can be seen that the salary of crawler engineers is not low!
2. Overview of Web Crawlers
Today's largest network is the Internet, and the largest crawlers are various search engines, including Google and Baidu. A web crawler is a program that crawls the information needed by humans in accordance with certain rules, which is mainly achieved by requesting URLs.
Generally speaking, the information searched by crawlers like search engines is very broad, and mixed with various advertisements, the information is not pure