what is the difference between failsafe's integration test and verify?

[hongbin ma]

hi, I'm new to failsafe,

i'm starting to move a test case from unit test to integration test, and
i'm using

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-failsafe-plugin</artifactId>
    <executions>
        <execution>
            <id>integration-tests</id>
            <phase>integration-test</phase>
            <goals>
                <goal>integration-test</goal>
                <goal>verify</goal>
            </goals>
        </execution>
    </executions>

​in my pom.

When I run "mvn verify", I ​found my new integration test ran twice.
I realized that both the "integration-test" and "verify" goal may
contribute to it.
Should I remove the line "<goal>verify</goal>" in pom?
But It seems most failsafe tutorials keeps both goals in their poms.

The question is, what are these two goals for?
The official explanation:

*integration-test for running the integration tests.*
*verify for checking the results of the integration tests.*

seems so vague to me.
Can any expert give me a concrete example?

thanks!

-- 
Regards,

*Bin Mahone | 马洪宾*
Apache Kylin: http://kylin.io
Github: https://github.com/binmahone