<p>A Hospital Information System (HIS) basically&nbsp; is a synonym for information management system at use in hospitals. Hospitals generate a wealth of data round the clock, 365 days a year, all of which needs to be well managed to ensure efficient functioning. Patients visit such establishments for outpatient care, in an emergency, or get admitted for either a short stay (a few hours) or long in duration (that may sometimes be indefinite). While in the past, the important modules of an HIS tended to be those that dealt with revenue management aspects, the recent trend sees a growing emphasis on improving overall efficiency and clinical management. It must be noted here that while some modules are required by all clinical establishments, requirement for others depend on the size of and specialities covered by a particular establishment.</p>