Why is my car overheating and smoking from under the hood

Help! Help! I have a 1995 hyundia sonata it overheates and smokes alot I tried putting coolant in it but it only got worse when it starts smoking I can see it boiling from the front where the radiator is at least I think its the radiator then I looked under the car and saw smoke coming from a pipe or something under the car what is it. Help help :cry: !