What tasks does using Docker solve in application development and deployment?

Docker solves several important tasks in application development and deployment:

• Environment isolation: containers allow running an application with the necessary dependencies and configurations, regardless of the host environment.
• Portability: containers work equally well on different machines and platforms, simplifying the transfer of applications between development, testing, and production.
• Simplified deployment: you can quickly deploy an application with the required configuration without manually setting up the environment.
• Scalability: containers are easily scalable and can be integrated with orchestrators (e.g., Kubernetes).
• Dependency management: all libraries and services are packaged together with the application, reducing the likelihood of conflicts.

Example: a developer creates a Dockerfile describing the environment for a Python application, then builds an image and runs a container where the application works the same on a local machine and a server.