Difference between Share Premium and Share Capital

Maine CLAT ke questions mein dono baat karne se dar gaya hai kya ye share capital se kuch to nahi hota? Lekin yeh bhi samajhna mushkil ho raha hai ki yeh share premium se kaisa hi hai. Share premium ke under company ko excess moolya uthaya ja sakta hai jab share public ko utarte hain lekin share capital company ko apne assets ke liye moolya utarna hai. Kya yeh dono hi hi share capital ka hi ek hissa hain jo company ko asset ki jagha pe jaata hai ya share premium ke hi kuch aur tareeke hain?