A more thorough explanation:

Definition: Trivial, adjective. Something that is unimportant, insignificant, or of little value.

Examples:

• Whether or not I wear a hat today is a trivial decision.
• Spelling mistakes in a text message are trivial errors.
• Compared to the cost of a house, the price of a cup of coffee is trivial.

The examples illustrate the definition of trivial by showing things that are small or insignificant in comparison to other things. Wearing a hat or making a spelling mistake are not important in the grand scheme of things. The cost of a cup of coffee is small compared to the cost of a house. These things are trivial because they are not worth much consideration or attention.