**1. Introduction**

In broad terms, mobility can be defined as the ability to move effectively and purposefully though the environment in order to accomplish tasks or achieve goals [1]. Mobility is impacted by personal, socio-economic, and environmental factors and, in turn, influences qualify of life, autonomy, independence, and everyday functioning [1, 2]. Verbrugge, Gruber-Baldini, and Fozard [3] characterized mobility as the most important functional domain for older adults, and current research has continued to support that assertion [4, 5]. Unfortunately, the prevalence of mobility limitations increases with age [1, 2]. Thus, mobility is a salient research area. This chapter will provide a comprehensive overview of mobility among older adults, including different aspects of mobility, factors that influence mobility, and future directions for study.
