Google Spiders: What is This ?

Google Spiders is a nickname for some google bots who are responsible for indexing the web in google index.
For example, when you create a new website or a new blog, Google sends the bots to fetch it and collect information about it (keywords, niche...etc), those bots are important for your website to be seen and be showed as results in Google searches, and if you want your website to be in the first results on Google you need to follow some tricks to get the first place in google searches.
and Google let the bots work with many algorithms to make sure that everyone gets them on his website and is fair to everyone.