Brand extension involves using an existing brand name to introduce a new product category. Nike is an example of a company that has successfully used brand extension. Originally starting with track running shoes, Nike has extended its brand into many new sports categories including shoes, apparel, and equipment for soccer, basketball, tennis, and more. Nike has also launched sub-brands under the Nike name like Nike Golf, Nike+, and Air Jordan to further extend its brand into new areas. Acquisitions of brands like Converse and Hurley have also helped Nike expand its product offerings over time.