Cloud computing is an Internet-based computing system that provides various applications and services such as storage, servers, infrastructure, low-cost networking, on-demand self-service, pay-as-you-go model, resource-independent pooling location, reasonable prices, quick elasticity, etc. Cloud computing is a way to increase capacity and add capacity without investing in new infrastructure such as computer hardware, it involves storage memory, licenses for new software, training for a person and in a dynamic way. Cloud computing is innovative that uses well-advanced computational power resource and gigantic improvement in storage capabilities, Cloud is the long dreamed vision of computing utilities, which helps to enable sharing of resources and services over the Internet. The cloud is a huge group of interconnected systems, which represents a major shift in how we store large information and run applications over time. Cloud computing is a shared pool of configurable and well-advanced computing resources, on-demand network access and is provided by the cloud service provider. The main advantage of cloud computing is cost-effectiveness. Cloud computing is used by many IT software industries. Clouds have a large pool of easily available configured resources which are well accessible and usable resources such as hardware like desktops, hard drives, platform and services. These resources in the cloud can be dynamically reconfigured and scale to varying degrees, allowing for optimal resource utilization. Cloud computing is a new dimension information technology (IT) and paradigm, the main objective of which is to provide a convenient, reliable, personalized and well-secured dynamic computing environment on a “Pay-per-use” basis for customers or users final....... middle of paper ......require less maintenance because you don't have to install or update software or hardware every time. The cloud mainly improves compatibility between operating systems. It requires always-on and high-speed Internet connectivity for a single login every time too. In the cloud sometimes the data stored in the cloud server is so important that customers who store their important data need to ensure that it is not lost or damaged. While in the cloud it is easy to verify the data integrity and whether the data is correct or not after completely downloading the outsourced data to be verified, downloading huge amounts of data just to verify the data integrity is a waste of time for the client communication bandwidth. with this it also brings challenging new security vulnerability threats to outsourced user data in the cloud computing system