In this paper attention is focused on the reactions and behavior of customers after purchasing. Consumer behavior is a young discipline that begins to be studied in the mid-twentieth century. The marketing concept combines the process of satisfying the needs of consumers that make purchases influence production creation. The development of modern technology enables the consumer to gain new insight into the consumption and possession of numerous information on products and manufacturers, so today marketing relations are increasingly accepted in the business and personal consumption market. In order to exchange reactions and behavior of consumers after purchasing, the work defines consumer behavior, information and consumer buying decisions, the relationship between marketing communication with consumer behavior, consumer behavioral behavior, consumer behavior and electronic communication. In addition, customer behavior after purchasing, in-depth marketing strategy, post-graduate evaluation, consumer retention, and product disposal are further elaborated. An on - line survey was also conducted as a method of quantitative research conducted on respondents (121). Survey research is presented in critical positions of the author.