Monks are a strength/defence class unlike the speed demons of D&D. They are tanky and often take a defensive role instead of directly attacking enemies. Monks are the only class which can wield gauntlets, although they can also use quarterstaves or simply go weaponless and still do fine in combat. Selvina (pictured above) also has a baseball bat-like quarterstaff with spikes embedded in it, which is more of a homage to her Barbarian side, but is envied by many Monks nonetheless.
Sending a Monk to the front line is very rare. They perform best when engaged one-on-one, generally acting as a physical wall between an opponent and the path they want to take. Many of their attacks are based around chaining combos, so a Monk who is not interrupted mid-fight is extremely deadly. They may find it difficult to make a dent in heavily-armoured or high-defence-stat enemies. Mages can mess them up if they maintain their distance.
To support the cliche because I can, most Monks are actually quite gentle and kind souls who don’t actively seek out battles. They can use their high defence and strength to do pretty much any physically demanding profession. The passivity associated with their class means that they do best at jobs which require others to come to them; blacksmithery, the culinary arts, acting as a clerk, jar-opening shopkeeping etc. Because their fighting style is so hard to master, Monks are considered to be very smart people even if they're actually as dumb as a rock.
Selvina edet Kathe (pictured above):
Selvina is Fëren's second cousin, having used her royal bloodline to gain control of a group of tribes located in Viërra's forest-covered mountains. She's actually a Monk / Barbarian hybrid, breaking her familial and societal expectations of becoming a mage, and a strong one at that. Her Barbarian side boosts her attack while she keeps the Monk skills, allowing her to beat people up with a scary intensity.