ORIGINAL
Its checks bulk email with passwords and gives us the working mails (And this is known as cracking / in noob terms you can call it cheap hacking)
There are many sites across the internet whose security is not that good …. hackers/crackers use their skills/tools and steal user credentials in bulk amounts and then they try the same email and passwords on other sites to crack accounts like netflix, nord vpn, prime, etc (Almost 50-70% users use same password on every site)
So to check these mails they use these tools
