NoSQL databases are non-relational databases that store data in a flexible and schema-free format, allowing for fast and scalable data processing. NoSQL databases are used in many applications, such as real-time analytics, content management, and social networking. Popular NoSQL databases include MongoDB, Cassandra, and Redis. Click for more Continuous delivery (CD) is the practice of automating the process of deploying code changes to production environments. CD aims to provide fast and reliable software delivery, with minimal risk and downtime. CD is an essential part of DevOps and agile software development. Popular CD tools include Ansible, Puppet, and Chef.