Just as there are 12 signs, there are 12 astrological houses that closely reflect these. The three most common house systems today are The Equal House System, The Koch System, and The Placidus System. The Equal House System is most frequently used and the one which students of astrology are advised to start with. It is one of the oldest and was favoured by the ancient Egyptians. It is also the simplest - the 12 houses being divided into 12 equal segments of 30 degrees.
The word 'house' suggests a place where one lives, and this is exactly what happens in a birthchart: the planets occupy different sections of the chart, showing the area where their energies will be at home and function best.
The houses of the birthchart are numbered in sequence from the first to the twelfth house, in an anticlockwise manner, with the first house starting on the far left of the chart - between 8 and 9 if viewed as a clock.