Cloud Computing has been growing over the last few years as a result of cheaper access to high speed Internet connection and many applications that comes with it. Its infrastructure allows it to provide services and applications from anywhere in the world. However, there are numerous technical, non- technical and security issues that come with cloud computing. As cloud computing becomes more adopted in the mainstream, these issues could increase and potentially hinder the growth of cloud computing. This paper investigates what cloud computing is, the technical issues associated with this new and evolving computing technology and also the practical applications of it. It also addresses and highlight the main security issues in cloud computing.