Both are same. They crawl our site & update our site in search engines database with the updated pages or information
1. Spider - a browser-like program that downloads web pages. 2. Crawler – a program that automatically follows all of the links on each web page. The main purpose of the web-spider is to crawl web pages, read and collect the content and follow the links both internal and external, the spider then bring back the information that is crawled...