Products go through distinct stages from introduction to decline or demise, according to the product life cycle concept. There are four stages: introduction, growth, maturity, and decline. In the introduction stage, public awareness of the new product is important. The growth stage focuses on advertising to tell consumers the product is better than competitors'. In maturity, sales grow fast then stabilize as most potential buyers have purchased. Finally, the decline stage occurs when sales begin to fall as customers are satisfied or replaced by new innovations. Different marketing strategies are needed at each life cycle stage.