CPU

The central processor: runs apps and the system. Phones use several cores of different sizes.

The CPU runs the operating system and apps. Phone CPUs mix fast performance cores with small efficiency cores to save battery. Core count and clock speed alone don't tell you real speed — architecture matters more.

Also called: processor cores, octa-core

More terms

Megapixels (MP)Millions of pixels in a photo. More MP allows more detail and cropping, but sensor size and processing matter more for quality.Boost clock (GHz)The highest speed a CPU or GPU runs for short bursts when cooling and power allow.LCDA screen with a backlight behind liquid crystals. Usually cheaper than OLED; blacks look greyer.mAh (milliamp-hour)A measure of battery charge. More mAh usually means a bigger battery, but battery life also depends on the screen, chip and software.Battery life (maker claim)Hours of use the maker states under its own test conditions. Real life depends on settings and use.Wireless chargingCharging by placing the phone on a pad (Qi / Qi2). Slower and warmer than cable charging, but convenient.

All glossary terms