Burglary covers loss or damage by theft involving entry to or exit from a building by forcible and violent means or any attempted threat. It is generally a good idea to have this policy as it provides a cushion effect to any losses as a consequence of break-in.
Many companies and individuals have taken this policy immediately they set up a business to cushion them from adverse effects of losses in the event of burglary. Burglary policy usually has a 1st loss which limits you per event. Please note that this does not cover theft from within and thus you would need a Fidelity Guarantee policy.