I need some detailed expert explanation of the difference between AMD and Intel.
Also I want to know that why people say AMD is ideal for graphics. Is that truly so? Can you Please help me.

Amd is highly for gaming and graphics

Google is your best friend for this.

As far as the gaming remarks. This can be proven true because AMD has higher clocking rates which cause it to be better for multimedia. Now, is this the most defining thing in a CPU? Not by a long shot. Although AMD has higher clocking rates they also heat up faster, bad power consumption efficiency too. Each of them have their goods and their bads...

If this is homework, then I would suggest using Google to find what you need. If this is for personal use and you're deciding whether you want an AMD or Intel CPU then I would suggest responding back and telling me what you plan on doing with your PC. As your intentions can affect what processor is best for you!