Raspberry pi is a small pocket sized computer having on-board GPIO pins to connect other peripherals and sensors. It has inbuilt Wi-Fi to connect with network and upload sensor data directly to any IoT cloud platform without using any external components.
Blynk is an IoT Platform to control Arduino, Raspberry Pi, NodeMCU and other microcontrollers over the Internet. Blynk app is a digital dashboard where you can build a graphic interface for any IoT based project by simply dragging and dropping widgets.
In previous tutorials we learned about installing operating system in Raspberry Pi, now lets move ahead to the first step in building any IoT project using Raspberry Pi, that is to upload the data to any cloud server using Raspberry Pi.