Raspberry Pi Zero 2W, Zero W, and Zero WH:

1. Compact Design: Small and lightweight, perfect for projects with limited space.
2. Powerful Performance: Equipped with a 1GHz ARM11 CPU and 512MB RAM for efficient processing.
3. Wireless Connectivity: Built-in Wi-Fi (802.11 b/g/n)  for easy connectivity.
4. Versatile Interfaces: Features a 40-pin GPIO header, Mini HDMI port, and CSI camera interface.
5. Multiple Versions: Available in Zero 2W, Zero W, and Zero WH variants to suit different project needs.
   【Raspberry Pi Zero Features】
    

   • Broadcom BCM2835

     • 1GHz ARM11 single-core processor

   • 512MB RAM

   • Micro SD card slot

   • Mini-HDMI port (1080p60 video output)

   • Micro-USB power

   • Micro-USB OTG port

   • 40PIN unpopulated GPIO header (compatible with A+/B+/2B/3B)

   • CSI camera connector

   • Composite video header

   • Composite reset header

   • Dimension: 65mm x 30mm x 5mm

   【Raspberry Pi Zero W Features】
    

   • Broadcom BCM2835

     • 1GHz ARM11 single-core processor

   • 512MB RAM

   • Added wireless connectivity

     • 802.11 b/g/n wireless LAN

     • Bluetooth 4.1

     • Bluetooth Low Energy (BLE)

   • Micro SD card slot

   • Mini-HDMI port (1080p60 video output)

   • Micro-USB power

   • Micro-USB OTG port

   • 40PIN unpopulated GPIO header (compatible with A+/B+/2B/3B)

   • CSI camera connector

   • Composite video header

   • Composite reset header

   • Dimension: 65mm x 30mm x 5mm

   【Raspberry Pi Zero 2W Features】

    

   • Broadcom BCM2710A1, 1GHz quad-core 64-bit Arm Cortex-A53 CPU

   • 512MB LPDDR2 SDRAM

   • 2.4GHz 802.11 b/g/n wireless LAN

   • Bluetooth 4.2, Bluetooth Low Energy (BLE), onboard antenna

   • Mini HDMI port and micro USB On-The-Go (OTG) port

   • microSD card slot

   • CSI-2 camera connector

   • HAT-compatible 40-pin header footprint (unpopulated)

   • Micro USB power

   • Composite video and reset pins via solder test points

   • H.264, MPEG-4 decode (1080p30); H.264 encode (1080p30)

   • OpenGL ES 1.1, 2.0 graphics

Raspberry Pi Zero : The Raspberry Pi Zero is half the size of a Model A+, with twice the utility. A tiny Raspberry Pi that's affordable enough for any project!

Raspberry Pi Zero W : Raspberry Pi Zero is a cost-effective, small-to-medium-size board in the Raspberry Pi family, adapts BCM2835 processor with ARM11 single-core. The Raspberry Pi Zero Zero W has all the functionality of the original Pi Zero, but comes with added WiFi and Bluetooth connectivity. 

Raspberry Pi Zero 2 and Raspberry Pi Zero 2 W
At the heart of Raspberry Pi Zero 2 W is RP3A0, a custom-built system-in-package designed by Raspberry Pi in the UK. With a quad-core 64-bit ARM Cortex-A53 processor clocked at 1GHz and 512MB of SDRAM, Zero 2 is up to five times as fast as the original Raspberry Pi Zero. As for heat dissipation concern, Zero 2 W uses thick internal copper layers to conduct heat away from the processor, sustaining higher performance without higher temperature.