What is docker do i need it?

Question
I hear a lot about Docker at the moment, can it make my website better ?
Answer
Most website owners will not be aware of Docker, in short is is a way of delivering applications in containers giving flexibility and isolation. A website is an application and docker can be used to run all the services required for an individual website from other docker containers. This allows the website to be isolated from other applications giving it an additional level of security.