The rear and the front camera hold many features making every phone work differently. There are some features that the smartphone usually holds are - Optical Zoom, smile-detection, self-timer, brightness setting e.t.c.
Back camera: PDAF, Optical Image Stabilization (OIS), Zoe capture,
Dual LED flash, Hyperlapse, Self timer, Face recognition, Panorama
Front camera: Auto HDR
Selfie Panorama, Live make-up, self-timer, Voice selfie, Auto selfie.