In programming, comparison operators are used to compare two values and determine if they are equal, greater than, or less than each other. They are an essential part of any language, as they allow you to make decisions based on the data that you have.

The following is a list of common comparison operators:

**Equal to (**Determines if two values are equal. This is one of the most commonly used comparison operators.`==`

):**Not equal to (**Determines if two values are not equal.`!=`

):**Greater than (**Determines if one value is greater than another value.`>`

):**Less than (**Determines if one value is less than another value.`<`

):**Greater than or equal to (**Determines if one value is greater than or equal to another value.`>=`

):**Less than or equal to (**Determines if one value is less than or equal to another value.`<=`

):

The answer to the question of which of the following is not a comparison operator is the plus sign (` + `

). While the plus sign can be used for arithmetic operations to add two values together, it cannot be used to compare two values.

In conclusion, the comparison operators are essential to any programming language. They allow you to make decisions based on the data that you have. The plus sign is not a comparison operator, as it cannot be used to compare two values.