Citric acid has high economic potential owing to its numerous applications. This work provides a review about the production of citric acid and its various applications specially in pharmaceuticals, foods and industrial. Citric acid is weak organic acid that occurs naturally in various fruits and vegetable, especially in the citrus fruits. Different manufacturing processes of citric acid were discussed in this review. This review presents the effect of various parameters on production of citric acid. The global market consumption of citric acid were discussed later stage and also market pattern. The detail application of citric acid is discussed in this review.