The Witch is the female counterpart of the male Wizard in Black Desert. Witches are known for their prudence in battle. In return for their long casting times they are rewarded with large-scale and powerful magic attacks. Their magic can burn, freeze and shatter opponents with the forces of natural elements such as fire, water, wind and earth.
Witches are extremely offensive magic users that rely on well timed dodges and attacks to take down opponents. Witches/Wizards must always be aware of their position on the battlefield as well as how much MP they have used up to calculate their next offensive. Many of the spells used are AoE heavy and do well against groups of foes.
The downside to this is that their long casting times make them frail in 1 vs 1 PVP and are generally better suited to 3 vs 3 battles to have a chance.
A Wizard/Witch shine in group play and generally do best in a party while leveling as their healing skills are just as valuable as their offensive ones. That isn't to say that you can't solo with this class, you may just find it harder and will need to stock up on potions as needed.
New players will find Witches very forgiving and easy to pick up and play, while also leaving plenty of room for individual player skill growth into expert level play.