The houses are usually (unless using the Equal house method) irregular slices of the chart which tell you which sphere or arena if your life is in focus depending on the planets which occupy it and the house ruler's position in the chart if the house is 'empty'. Each astrological house stands for a particular sphere of activity. The house division of a horoscope varies in each birthchart. This is calculated according to the exact time and geographic place of birth.
Find out what this all means by reading more of this article by Sarah Bartlett