Answer: A protostar is the early stage of formation of star.
Explanation: Protostars are formed in space. Space is full of gases dust , which form stars.
A Protostar can be defined as the collective mass of gases. Protostar is the young stage of the star.
Formation of stars takes place by collapse of clouds. Stars generally formed when cloud of hydrogen and helium collapse or fused together.
Protostar is consider as baby star because it is still collecting gases from clouds.
Formation of Protostar takes place under the influence of gravity at that time gases come together and fused to form Protostar.
Process of Protostar formation is known as accretion.