public String getKey() {
        return this.key;
    }
<p>
A string that you can use to assign a value. The combination of tag keys and values can help you organize and
categorize your resources.
</p>

@return A string that you can use to assign a value. The combination of tag keys and values can help you organize
        and categorize your resources.
aws-java-sdk-applicationsignals/src/main/java/com/amazonaws/services/applicationsignals/model/Tag.java