I found this
Within a given architecture type there are multiple versions. armeabi-v7a is the older target, for 32 bit arm cpus, almost all arm devices support this target. arm64-v8a is the more recent 64 bit target (similar to the 32-bit -> 64 bit transition in desktop computers). Most new devices are 64 bit, but not sure. arm64-v8a devices can run code compiled against armeabi-v7a, it's backwards compatible.
As of later this year, the Play store will require you to upload an arm64-v8a APK as the minimum, because this gives the best support for newer devices. You will also be able to upload other APKs to support other device types.
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