Perhaps, the most obvious way to explain what morality is that it is a simple understanding of what is right and what is wrong. In other words, morality is the attempt to understand the difference between right and wrong.
Yet, everything is not as simple as it may seem. What it presupposes is that the definition between the good and the bad may be different for everyone which is the reason why it has been difficult for the philosophers to define what morality actually is.
It is also important to take into account the following: when defining what morality is, one needs to figure out which codes are singled out as moral by the society. As you have already understood, a lot of research work needs to be done when you are working on the subject of morality. Thus, you will most definitely need to dig more so that to come across different opinions regarding such subject as morality. Besides, do not forget that you will also need to provide at least a few examples.