Crawling is the process for reading website content for search Engine Indexing. It is a Search Engine's program to scan every Old and Newly add websites.

A search engine crawler is a program or automated script that browses the World Wide Web in a methodical manner in order to provide up to date data to the particular search engine. The process of web crawling involves a set of website URLs that need to be visited, called seeds, and then the search engine crawler visits each web page and identifies all the hyperlinks on the page, adding them to the list of places to crawl.

Crawler checks all the website content and submits them to google webmaster.

It is automatic written code which scans every site on the web to list them on the search results. It takes consideration of many factor while scanning.

A crawler is a program used by search engines to collect data from the internet. When a crawler visits a website, it picks over the entire website's content (i.e. the text) and stores it in a databank. It also stores all the external and internal links to the website.

a program that systematically browses the World Wide Web in order to create an index of data.
3.

Crawler
 

When Google visits your website for tracking purposes. This process is done by Google’s Spider crawler

A program that systematically browses the World Wide Web in order to create an index of data.

crawl help to search engines to get a relevant data to their servers

Crawling or web crawling refers to an automated process through which search engines filtrate web pages for proper indexing.

Crawler is a software which helps in Indexing the links in case of search engines.

A crawler is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "spider" or a "bot."

crawler is google bot made to check all website.

A search engine crawler is a program or automated script that browses the World Wide Web in a methodical manner in order to provide up to date data to the particular search engine

Crawler is one type of google spider system that run with and fatch automatically all worldest website.