Web crawler berfungsi untuk men-download dan mengindeks konten dari seluruh Internet. Tujuan dari bot semacam itu adalah untuk mempelajari tentang setiap halaman di web, sehingga informasi tersebut dapat dimunculkan di SERP saat ada yang mencari. Crawler disebut juga spider atau bot mesin pencari
It's called "web crawler" because "crawl" is a technical term for accessing websites and obtaining data through software programs automatically.
Web crawler bots start indexing from seed, or list of known URLs. They "crawl" web pages at the URL first. When the bot crawls the web page, it will find a hyperlink to another URL, and it will be added to the list of pages that will be explored next.
Crawler bots from several leading search engines, namely:
There are also many less common web crawler bots, some of which are not related to any search engine.
SEO stands for search engine optimization, and is a strategy for preparing content for search engine indexing so that the website can appear on the main page in the SERP.
If spider bots do not crawl the website, the website or content page would not be indexed, and certainly will not appear in search results. Therefore, if the website owner wants to get organic traffic from search results, they should not block this bot.