What's the difference between "implementation", "api" and "compile" in Gradle?
00:51 12 Jun 2017

After updating to Android Studio 3.0 and creating a new project, I noticed that in build.gradle there is a new way to add new dependencies instead of compile there is implementation and instead of testCompile there is testImplementation.

Example:

 implementation 'com.android.support:appcompat-v7:25.0.0'
 testImplementation 'junit:junit:4.12'

instead of

 compile 'com.android.support:appcompat-v7:25.0.0'
 testCompile 'junit:junit:4.12'

What's the difference between them and what should I be using?

gradle build.gradle dependency-management gradle-plugin transitive-dependency