Using cloud computing, we can get a variety of IT services, such as programme execution environments, application development environments, and data storage facilities, all from a single location over the internet, or" under one roof." On a leased basis, these services are provided to the customer. Apart from these features, there are numerous security concerns, as consolidating everything into the cloud makes it easier for hackers to gain access. Security is the most momentous roadblocks to the widespread adoption of cloud computing. An overview of cloud computing and its security challenges is provided in this paper.