Define what is difference between crawling and caching?

Crawling is vising a website by search engines and get information that includes Content, Description & keywords and indexing is making database of the information that has been collected by crawler.

Caching is a technology used with the memory subsystem of your computer. The main purpose of a cache is to accelerate your computer while keeping the price of the computer low. Caching allows you to do your computer tasks more rapidly.
 
Crawling is the process of Spiders or search engine's bot finding new updated content/images/videos etc. on websites and information sends back to respective search engine. ... And During the indexing, the spider processes the words on a page and where those words are located.
 
Difference Between Crawling, Indexing and Caching Crawling: Crawling is the process of Googlebot ( Software ) finding/Scan new updated content/images/videos etc..on websites and information sends back to Google. Indexing: Indexing is the processing of the information gathered by the Googlebot from its crawling activities. Once documents are processed, they are added to Google’s searchable index if they are determined to be quality content. During indexing, the Googlebot processes the words on a page and where those words are located. Information such as title tags and ALT attributes are also analyzed during indexing. Caching: Googlebot took a snapshot of web pages are updated in the last visit or crawl, whenever website goes down/not yet indexed latest changes made in the website at the time it will shows the last version which was saved.
 
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