Marketing involves creating, communicating, delivering, and exchanging products and services that have value for customers. The core aspects of marketing include satisfying customer needs, facilitating exchange between buyers and sellers, and creating value through the four P's of product, price, place, and promotion. Marketing can be performed by individuals, businesses, and organizations and involves targeting customers through various channels. Over time, the focus of marketing has shifted from production-oriented to market-oriented and now emphasizes value-based exchange and customer collaboration.