Answer:
Food additives are substances added to food to preserve flavor or enhance its taste, appearance, or other qualities. Some additives have been used for centuries; for example, preserving food by pickling, salting, as with bacon, preserving sweets or using sulfur dioxide as with wine. To maintain the nutritional quality of a food - e.g. by avoiding degradation of vitamins, essential amino acids and unsaturated fats. To provide ingredients for consumers with specific nutritional requirements e.g., sweeteners in tooth friendly confectionary or bulking agents for those seeking to reduce caloric intake.
Source:
Wikipedia
I also used multiple websites saying the same thing.
Such as Food-info.net
Www.Just-Food.com