A web crawler is a relatively simple automated program, or script, that methodically scans or "crawls" through Internet pages to create an index of the data it's looking for,It is also called Web spider or web robot.
A web crawler is a relatively simple automated program, or script, that methodically scans or "crawls" through Internet pages to create an index of the data it's looking for. Alternative names for a web crawler include web spider, web robot, bot, crawler, and automatic indexer.There are many different uses for a web crawler. Probably the most common use associated with the term is related to search engines. Search engines use web crawlers to collect information about what is available on public web pages. Their primary purpose is to collect data so that when Internet surfers enter a search term on their site, they can quickly provide the surfer with relevant web sites.When a search engine's web crawler visits a web page, it "reads" the visible text, the hyperlinks, and the content of the various tags used in the site, such as keyword rich meta tags. Using the information gathered from the crawler, a search engine will then determine what the site is about and index the information. The website is then included in the search engine's database and its page ranking process.
hm , you are right ... Web crawlers comes to your site and update all old database of your site with the new one.
A web crawler is a script that "crawls" through the website so that its data can be indexed. This is why it's important to make sure your website pages are properly linked to each other so that they can be indexed faster by these web crawlers, or search engine bots.
They are also known as ants and web spiders. The role of web crawlers are to browse the web in a systematical manner wherein to copy the visited pages and index them for fast searching.
A Web crawler is a relatively simple automated program or script that methodically scans or "crawl" through the Internet web pages indexed data to find it. Alternative names for Web crawlers, including spiders, bots, robots, crawler and automatic indexer.There many different uses Web crawler.
the search engines call them different things, crawlers, robots & spiders, they all do the same thing in indexing your site for better optimisation, they do this periodically on your site popularity, the more popular the more often they will visit to look for changes, new links / urls etc.
