Difference Between Conditions: “is”, “is not “, “exists” and “does not exist”

• "is": Shows only contacts where the custom field matches the specified value. It excludes contacts where the custom field does not exist.

• "is not": Displays contacts where the custom field exists but does not match the specified value, excluding any contacts lacking the custom field.

• "exists": Includes all contacts having the custom field, regardless of its value.

• "does not exist": Identifies only contacts that lack the custom field.

Understanding these conditions ensures accurate filtering without omitting relevant contacts inadvertently.