This article focus to Define and Discuss on Buyer Behavior. The buyer or consumer encounters and progresses through a number of steps with regards to the acquisition of a product to meet their needs. They are as follows: Problem recognition, Information search, Evaluation of alternatives, Purchase decision and Post-Purchase behaviour. The size, complexity and frequency with this process depends on the buyer themselves and the nature of the purchase. Things like the purchase price, risk and impact of the outcome all influence the character of this process.