Parallel Play refers to a play where the child plays near or beside another child using some or all of the same/similar materials as the other child without trying to modify or influence the other child and being mainly concerned with toy materials, not with relating to the other child. Predominates between 24-30 months.
Moreover, Parallel play is when children play alone but are aware of and interested in what another child is doing; a largely a non-interactive play in which players are in close proximity but do not often attempt to influence each other.