Crating is a hot topic among dog owners.  Crating a puppy is a means of ensuring that it's under the owners control, even when they are absent.  The crate itself is a sort of cage.

Dogs: To Crate or Not to Crate?

Provided it's not used for excessive lengths of time, or as a punishment, crating is a good practise.  Read the pro's and con's here.

Dog Crating Made Easy

"It's easy when you know how".  That applies to dog crating and other training as much as anything else.  Find out the basics of crating dogs.

Getting Puppy to love his crate.

Most take to crates straight away, others need a little encouragement before they view a dog crate as home.  Again, it's easy when you know how.