Product life cycle refers to the stages that a product goes through from its introduction into the market until it is removed from the market. The product life cycle has four stages: introduction, growth, maturity, and decline.

The introduction stage is when the product is first introduced to the market. During this stage, the product is not well known, and sales are low. The focus is on creating awareness of the product and generating interest among potential customers.

The growth stage is characterized by a rapid increase in sales. The product is gaining acceptance in the market, and more people are becoming aware of it. During this stage, the focus is on maintaining the product's momentum and expanding its customer base.

The maturity stage is when the product reaches its peak in terms of sales. The rate of growth slows down, and the market becomes saturated with competitors. During this stage, the focus is on retaining market share and differentiating the product from competitors.

The decline stage is when the product starts to lose market share and sales decrease. This may be due to factors such as changes in consumer preferences, the emergence of new technologies, or increased competition. During this stage, the focus is on managing the product's decline and phasing it out of the market.

Understanding the product life cycle is important for companies as it helps them to develop appropriate marketing strategies and make decisions about product development, pricing, and distribution. Companies can also use the product life cycle to identify new opportunities for growth and to plan for the eventual decline of a product.