Diet Coke (also branded as Coca-Cola Light, Coca-Cola Diet or Coca-Cola Light Taste) is a sugar-free and low-calorie soft drink produced and distributed by the Coca-Cola Company. It contains artificial sweeteners instead of sugar.

A diet soda is the low- or no-calorie version of a drink where sugar is replaced with a non sugar sweetener. People may choose diet soda to help manage blood sugar levels, lower the risk of tooth decay or manage weight.

Diet Coke has a sweet, carbonated cola flavor, but with a noticeably different taste compared to regular Coke due to its artificial sweeteners, which can sometimes leave a slightly distinct aftertaste; many describe it as a lighter, crisper version with less sweetness than the original Coke.
Key points about Diet Coke taste:
Less sweet:
Because it uses artificial sweeteners instead of sugar, Diet Coke is significantly less sweet than regular Coke.
Distinct aftertaste:
Some people perceive a slight artificial sweetener aftertaste when drinking Diet Coke.
Cola flavor profile:
While the sweetness is different, Diet Coke still maintains the recognizable cola flavor profile.
Lighter taste:
Compared to regular Coke, Diet Coke is often described as having a lighter, crisper taste.