Nice to meet you, Amol, and thanks for checking us out!
You can think of Tessel as a dev board designed to have a great developer experience.
For example, if you're trying to post climate data to a cloud, you should be able to do that within 15 minutes of unboxing, because the tessel has a climate module you can plug & play, a high-level API for gathering sensor data, built-in Wifi with HTTP requests, and the ability to work with Node libraries such as PubNub.
Or if you'd rather work with custom circuitry, tessel has simple APIs for I2C, UART, and SPI protocols in addition to analog/digital/PWM capabilities.
You can use Tessel to make a weekend project, to build a prototype of a product, or even to learn to code, starting here.
Our homepage should give you a good rundown of features and what it looks like to build on Tessel, but I'm happy to answer any specific questions!