Cloud computing is a technology that allows users to access and store data, applications, and services over the internet instead of on a local server or hard drive. This allows for greater flexibility, scalability, and cost-efficiency, as users can access resources from anywhere with an internet connection. Cloud computing also offers advantages in terms of security, as data is often stored on multiple servers in different locations to prevent data loss or theft. The field of cloud computing is constantly evolving, with researchers focusing on improving efficiency, security, and scalability of cloud services.