Cloud computing is important in today's computer world, offering software, platform, and infrastructure services. Security is a major concern in cloud computing, with users accessing resources through the internet. Different cloud services like IAAS, PAAS, and SAAS provide infrastructure, platform, and software access. However, there are security issues and challenges in cloud computing, with no guarantee of information security by vendors. The paper discusses security issues, challenges, and threats in cloud computing, focusing on data protection and overall security concerns.