Roaming is moving a hero around the map outside their own lane. The player leaves the position they were holding and goes to help allies in other lanes, place wards, catch lone enemies, or take part in fights far from their own zone. The verb "to roam" means "to engage in roaming," and a "roamer" is a hero or player who does this regularly.
How it works in practice
A typical situation: in the mid lane, a player quickly gains an advantage or realizes the opponent is weakly controlling neighboring parts of the map. Instead of continuing to stand in place, they move to a side lane and attack the enemy together with an ally. If the [gank](/dictionary/gank) succeeds, the team gets a kill, gold, and tempo, while the opponent loses time and resources.
Roaming almost always involves the player:
- watching the minimap and noticing where the enemy is weak or out of position;
- calculating timing so they can return to their lane without losing experience and gold;
- coordinating with the team so that allies are ready to support the attack.
The cost of the decision
Leaving the lane always has a cost. While the hero is away, their lane is left unattended: an enemy player can calmly farm last hits on creeps, push the tower, and build up an advantage. That is why roaming is justified when the gain from a kill or map control outweighs the losses at the abandoned position. A failed roam, in which the hero spends minutes on an empty trip and finds no one, is considered one of the common mistakes.
Good preparation includes the ability to read the map: which enemy heroes are absent from their lanes, where allies might be, and whether the enemy has an ability to escape quickly. This is where the concepts of [game sense](/dictionary/game-sense), [timing](/dictionary/timing), and [positioning](/dictionary/positioning) intersect.
Who roams most often
Roaming is especially characteristic of the [midlaner](/dictionary/midlaner): the middle lane is shorter and closer to other parts of the map, so it is easier to reach the side zones quickly from there. [Supports](/dictionary/support) also roam often, since they depend on farm less than the team's main heroes and can afford to leave the lane.
Much also depends on the chosen hero. Some are suited to abilities with instant movement or crowd control, while others are better off waiting in place and accumulating items. Heroes built for frequent sorties are picked precisely for the ability to quickly appear where the enemy does not expect them.
Origin of the word
The word comes from English: "roam" means "to wander, to travel about." In Russian-language gaming slang it took hold in several forms and is used not only in Dota 2 but also in other MOBAs. In shooters, the word "rotation" is used for similar movement, but it is a different concept: there it refers to changing position within a round and distributing the team's forces.