Can you explain what is meant by a container in an operating system?

A container in an operating system is an isolated environment that allows applications to run along with all their dependencies (libraries, configurations) in a single package. Containers utilize OS kernel features (such as namespaces and cgroups in Linux) to isolate processes, resources, and the filesystem.

Unlike virtual machines, containers do not emulate a full OS but use the host system's kernel, making them more lightweight and faster.

Example: A Docker container runs a web application with the required version of the programming language and libraries, ensuring it works the same on any machine with Docker, regardless of the installed software.