Welcome to Celo software, the site for online developing software. Softwares are the programming unit of any computer. If the hardware is the body and organs, the software is the brain and mind of the computer. Any device without software will be as useless as a lunatic with a healthy body. So is the importance of software. Here in this article, we shall discuss the software that is used to build games in particular. Game design and development is also known as interactive entertainment is a huge industry and employes around 150,000 U.S. workers. It provides entertainment to more than 155 million of the population of America and in 2014, generated sales of $22.41 billion, that included the software, the hardware, and other gaming accessories. The industry has been growing at a staggering 10 percent rate annually, compared to a mere 2.4 percent growth of the entire US economy. In 2012, Game design and development contributed $6.2 billion to the total GDP of the US.