Plants exposed to salt stress in their environment can be adversely impacted. The responses of plant to salinity stress are reviewed with emphasis on physiological, biochemical, and molecular mechanisms of salt tolerance. Methods within current literature for enhancing salt tolerance of plants are provided. Issues concerning ion accumulation, compatible solutes, antioxidative enzymes, plant hormones, photosynthesis of plants to salt stress are explained. Studies of potential mechanism for halophytes to mediate salt tolerance are also included. This paper provides information for use in interdisciplinary studies for assessment of ecological significance of salt stress to plant communities.