In simple terms , Raspberry Pi is a small computer with programming capability . The main difference between normal computer what we use like laptops , desktop and Raspberry Pi is , In normal computers and laptops you can only perform your day to day general purpose task but in raspberry pi we can perform two major task :

1. We can use it as a normal personal computer by connecting peripherals like Keyboard, mouse, display to the Raspberry Pi, it will act as a mini personal computer.

2. And we can also use it as a IoT based application such as real time Image/Video Processing, IoT based applications and Robotics applications .

Raspberry Pi is slower than laptop or desktop but is still a computer which can provide all the expected features or abilities, at a low power consumption.

Versions of Raspberry pi models

There are different versions of raspberry pi available as listed below:

1. Raspberry Pi 1 Model A

2. Raspberry Pi 1 Model A+

3. Raspberry Pi 1 Model B

4. Raspberry Pi 1 Model B+

5. Raspberry Pi 2 Model B

6. Raspberry Pi 3 Model B

7. Raspberry Pi Zero

Out of the above versions of Raspberry Pi, more prominently use Raspberry Pi and their features are as follows:

Raspberry Pi 3 Hardware Details

The On-chip hardware of Raspberry Pi 3 (here) is as shown in below figure,

Some Hardware Components shown above are mention below:

1. HDMI (High-Definition Multimedia Interface): It is used for transmitting uncompressed video or digital audio data to the Computer Monitor, Digital TV, etc. Generally, this HDMI port helps to connect Raspberry Pi to the Digital television.

2. CSI Camera Interface: CSI (Camera Serial Interface) interface provides a connection in between Broadcom Processor and Pi camera. This interface provides electrical connections between two devices.

3. DSI Display Interface: DSI (Display Serial Interface) Display Interface is used for connecting LCD to the Raspberry Pi using 15-pin ribbon cable. DSI provides fast High-resolution display interface specifically used for sending video data directly from GPU to the LCD display.

4. Composite Video and Audio Output: The composite Video and Audio output port carries video along with audio signal to the Audio/Video systems.

5. Power LED: It is a RED colored LED which is used for Power indication. This LED will turn ON when Power is connected to the Raspberry Pi. It is connected to 5V directly and will start blinking whenever the supply voltage drops below 4.63V.

6. ACT PWR: ACT PWR is Green LED which shows the SD card activity.

Thanks for reading !!!