Google Play services11.9.51 (430-177350961)

Google Play services is used to update Google apps and apps from Google Play.
This component provides core functionality like authentication to your Google services, synchronized contacts, access to all the latest user privacy settings, and higher quality, lower-powered location based services.
Google Play services also enhances your app experience. It speeds up offline searches, provides more immersive maps, and improves gaming experiences.
Apps may not work if you uninstall Google Play services.

Google Play Services 23.43.13 (100300-577232161)

This app makes sure the rest of your apps are up-to-date. It keeps checking if all installed apps have the latest available versions. With google play services you can authenticate google services synchronize your contacts access the latest privacy settings and use higher quality location-based services that consume less energy. The google play services also improve the overall user experience of your device. It makes searching offline more immersive and improves the gaming experience by optimizing ram.

other menu options within google play services let you manage all your apps (not necessarily the ones you have installed), establish location settings, and even manage your google fit account. Gmail play services is an essential app for any android device with an operating system. Many other apps could start having problems without it.