Players can place items and structures as they walk from place to place and you can see stuff placed by other players as you bring each in-game area "online". These items can be storage lockers, ladders and ropes to climb up difficult terrain, charging stations for your motorcycle, or even entire roads/highways stretching across a landscape. If you use an item from another player, you can give them likes. Note that you never see another player's character.
It's such a nice experience to come back to a river you bridged with a ladder and see hundreds of likes. There's not much combat in the game because it's generally easier to avoid confrontations, and the little combat that is present is heavily geared towards non-lethal weapons.
https://store.steampowered.com/app/227300/Euro_Truck_Simulat...