Explain the concept of containerization and its application in development and deployment of applications.

Containerization is a technology that packages an application together with all its dependencies, libraries, and configurations into a single isolated container. This container can be run on any system where a container engine (such as Docker) is installed, without the need to reconfigure the environment.

Application in development and deployment:

• Portability: Containers ensure that the application will work the same everywhere — on a developer's local machine, testing server, or in production.
• Isolation: Each container operates independently, reducing conflicts between applications and simplifying dependency management.
• Development acceleration: Fast start and stop of containers make it easy to test and deploy new versions of applications.
• Scalability: Containers are easily scalable horizontally, which is convenient for cloud and microservices architectures.

Example: a developer packages a Python application with the necessary libraries into a Docker container. This container can be run on any server with Docker without additional environment setup.