The ESP-WROOM-32 development board occupies a specific niche that's worth being clear about: it's not a faster Arduino, and it's not a smaller Raspberry Pi  it's a purpose-built IoT chip that puts real processing power and both Wi-Fi and Bluetooth on one small module, at a price that makes it disposable enough to embed permanently into a project.

That's the actual reason it's become the default choice for connected hobbyist and product-development projects alike: an 8-bit Arduino needs an external shield just to get online, and pairing a full Raspberry Pi for something that only needs to read a sensor and post a value online is overkill. The ESP32 sits in the gap between those two — a dual-core processor fast enough for real application logic, encryption, and a full TCP/IP stack, but priced and powered like a microcontroller rather than a computer.

Where it earns extra credit over cheaper Wi-Fi-only alternatives is the built-in Bluetooth radio alongside Wi-Fi  a single board that can simultaneously talk to a phone over BLE and report data to a cloud server over Wi-Fi, without needing two separate modules. Combined with a generous GPIO count and native support for SPI, I2C, and CAN, it rarely becomes the bottleneck in a design, which is precisely why it's outlasted several newer competitors as the default recommendation for IoT prototyping.

The honest caveat: for something that will never touch a network, a plain microcontroller like an Arduino Nano is cheaper and simpler. This board earns its price specifically when wireless connectivity  Wi-Fi, Bluetooth, or both  is actually part of the project.