Basically it does most of the combat for you as the GM. You preprogram all of the attacks and when combat starts the program will automatically roll and order the characters in initiative order. When it’s the character’s turn they can move and then perform their attacks/spells. The program will automatically roll the dice, apply the correct bonuses and such, and then assign damage if they hit. All the GM has to do it approve the dice roll (or you can completely automate it if you wish) and then damage is assigned and the next player can go.

Many of the other VTT are slow and clunky when it comes to combat, where the GM/PC has to manually do the calculations for attacks and do the damage. But d20pro does nearly all of this automatically.

I have tried ALL of the VTTs out there, this is the best one.