The AttachToComponent node attaches an Actor to the Component referenced in the Parent input parameter. The transformations of the Parent Component affect the Actor attached. Optionally, Socket Name can be used to identify the place where the Actor will be attached.

In the screenshot, the EquipShield custom Event uses the AttachToComponent node to equip a Shield Actor Component on a Skeletal Mesh Component. The Skeletal Mesh Component has a socket named LeftArmSocket, which is used to position the shield on the arm: