The different types of Raspberry Pi boards available are:
1. Raspberry Pi 4 Model B: This is the latest and most powerful Raspberry Pi board. It features a 1.5GHz 64-bit quad-core processor, 4GB RAM, dual-band 802.11ac wireless LAN, and Bluetooth 5.0.
2. Raspberry Pi 3 Model B+: This board is an upgraded version of the Raspberry Pi 3 Model B. It features a 1.4GHz 64-bit quad-core processor, dual-band 802.11ac wireless LAN, and Bluetooth 4.2.
3. Raspberry Pi Zero W: This is the smallest and most affordable Raspberry Pi board. It features a 1GHz single-core processor, 512MB RAM, and Bluetooth 4.1.
4. Raspberry Pi 3 Model A+: This board is an upgraded version of the Raspberry Pi 3 Model A. It features a 1.4GHz 64-bit quad-core processor, dual-band 802.11ac wireless LAN, and Bluetooth 4.2.
5. Raspberry Pi Compute Module 3+: This board is designed for industrial applications. It features a 1.2GHz 64-bit quad-core processor, 1GB RAM, and dual-band 802.11ac wireless LAN.