What's the difference between toning and mass?

Hi, I am 21 and I started going to aerobic and gym. I hope you could answer my question, because it’s very important to me. What’s the difference between toning and bulking mass?

Hi, I did both-toning and bulking mass, and it worked for me. However, I had to change my diet. I did high reps and lower weights for toning. The difference between toning and bulking is that for toning you need moderate loads and long sets, and for bulking you need heavy weights and short sets. Girls usually do only toning, and guys bulking or both. Bodybuilders use bulking as overload principle. First, I did toning, because I wanted to start with it, and then when I lost the fat and when I felt ready, I started with bulking. I’m doing great, and I have to thank my trainer for that.