In Hydra, the -t option specifies the number of tasks to run in parallel. This allows you to control how many connections Hydra will attempt to make simultaneously during a brute-force attack. For example, using -t 4 would mean that Hydra will try to make 4 connections at the same time.
Here's an example of how to use it in a command:
hydra -l username -P password.txt -t 4 localhost ftp
This command will attempt to brute-force the FTP service on localhost using the specified username and password list with 4 parallel tasks.
