What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference Between Lime, Orange, Citrus and Lemon

Our world has a great variety of fruits. These fruits are different in color, taste and size. However, some fruits have similar properties and they are grouped together. Lime, Orange, Citrus and Lemon are examples of these fruits. These have similar properties and people often use them interchangeably.