[b]"What is the main purpose of a web crawler program? Can someone explain?"[/b] or [b]"What is the main purpose o

"Hey everyone, quick question—what is the main purpose of a web crawler program?

I keep hearing about web crawlers, but I’m not entirely sure how they work or why they’re so important. Like, do they just scan the internet all day? And how do search engines even use them?

Also, if anyone knows—why do some sites block crawlers? Is it just to save bandwidth, or is there more to it?

Would love to hear some simple explanations or even real-world examples. Thanks in advance!"

*(P.S. Sorry if this has been asked before—tried searching but got lost in the results lol.)*