By circuit training you should understand a group of different exercises performed back to back in a round-robin "circuit" fashion. It is different from the traditional method of training where multiple sets of single exercise should be done before moving on to the next exercise. You can involve into your circuit training various exercises from weight lifting to machines to bodyweight exercise and even bouts of walking or running.  Circuit training is very useful and effective. By doing different exercises back to back, the rest between the sets decreases giving you the opportunity to do more in a shorter period of time.
Another advantage of this training is that more calories are burnt as compared with the traditional training methods. This is achieved due to the less rest or no rest when switching from one exercise to the next. When you do multiple sets of the same exercise it is necessary to rest the muscles before you work them again. While circuit training, you switch exercises so your muscles have the ability to rest from the previous exercise while you are doing the next exercise. The third benefit of circuit training is that your cardiovascular system isn't getting to rest. It is possible to do resistance and cardio training at once. There are two main ways by which the cardiovascular system provides energy to the muscles:
The first way is an oxidative or also known as "aerobic." During the aerobic workout the intensity level is low and gives the ability to your body to supply oxygen to the muscles rapidly enough so that it could be used for energy. You can do aerobic exercises (walking, running) for long durations from 2 minutes up to multiple hours in the case of long distance running and bicycle riding. The second way from which muscles receive energy is known as "anaerobic" or without oxygen. Here, the exercise intensity is very high that's why in this case the energy is provided to the muscles through a chemical process. This energy is only for a short period of time and depending on the specific process (ATP-CP or glycolysis) can last from about 10 seconds to 2 minutes. These different energy pathways (aerobic/anaerobic) don't provide full benefits if they are worked independed of each other. It is useful to involve anaerobic and aerobic activities to your workout. As a result anaerobic activity will provide a high intensity workout which will burn more fat, make your heart and cardiovascular system stronger and also provide more stamina and a faster recovery time. Another great benefit is that since you use resistance exercises you will be able to build lean muscle mass which will further help to burn fat by increasing your metabolism (and of course you will look better and be stronger). It is also very useful to combine your wokrout plan with a sensible diet to achieve great weight loss results. So, good luck with your training and stay healthy.
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