Guitar Tuned Down a Whole Step

What does it mean to tune down a whole step?

Full Step Down is a tuning where all six strings are tuned down 1 full tone. Your guitar will sound lower and the strings will be looser, but you can still play any song the same way, it will just sound lower.

Can I tune my guitar down a whole step?

How to Tune Your Guitar Down 1 Whole Step – Guitar Basics – Time: 0:276:08 –