This document defines several marketing terms and concepts. It discusses market segmentation, which is dividing customers into groups based on demographic, geographic, psychographic, behavioral, or other characteristics. It also outlines the stages of the product lifecycle from introduction to growth, maturity, and decline. Additionally, it explains the 4 Ps of marketing - product, price, place, and promotion. Finally, it provides brief descriptions of mass market, niche market, unique selling points, and common types of market research including focus groups, interviews, phone surveys, and product testing.