The Not equal to operator is used to select all those contacts that do not match the value entered in the condition input field.
Setting the First Name condition to Not equal to, with Sam as the input field value, selects all those contacts whose first name is not Sam. Contacts whose first name is, for example, Samantha, Sammy, Paul, John and so on, are selected.
The Not equal to operator can also be applied when multiple values are set for a given attribute. It is used to select those contacts for which the relevant attribute value does not match any of those entered in the condition input field. In this instance, the Not equal to operator applies to string data types only.
See Input field types for more about each input field.