What does a choke do on a motorcycle?

Most of the old-generation motorcycle riders have faced the problem of starting the engine in cold mornings, and the choke helped on these occasions. So, what does a choke do on a motorcycle?
This article takes you through the topics of what does a choke do on a motorcycle and why it is required, do modern motorcycles with fuel-injection engines have a choke, and a few frequently asked questions on the topic.