It is having a graphical user interface called xhydra for making it easier to use.

Hydra is a parallelized network logon cracker. Hydra works by using different approaches of generating possible passwords, such as wordlist attacks, brute-force attacks and others. Hydra is commonly used by penetration testers together with a program named crunch, which is used to generate wordlists. his tool makes it possible for researchers and security consultants to show how easy it would be to gain unauthorized access to a system remotely.

for creating a wordlist using crunch

crunch 3 4 -o rockyou.txt

crunch <min> max<max> <characterset> -t <pattern> -o <output filename>