adb install

Pushes an Android application (specified as a full path to an .apk file) to an emulator/device.

adb install [option] <path>

adb install test.apk
adb install -l test.apk forward lock application
adb install -r test.apk replace existing application
adb install -t test.apk allow test packages
adb install -s test.apk install application on sdcard
adb install -d test.apk allow version code downgrade
adb install -p test.apk partial application install