Psychology can be defined as the systematic study of behaviour and the physiological and cognitive processes that underlie it. It aims to describe, explain, predict and modify behaviour. It is an academic subject with close links to biology and sociology.
Psychology is practical; it offers a vast store of information and suggestions about issues that concern everyone. These range from broad social issues such as how to improve eyewitness testimony, to highly personal ones such as ways of controlling anger or stress. Psychology offers a way of asking precise questions about key issues in society and of testing ideas using a logical and rigorous approach.