What is the difference between amd and intel processor ?

A very broad question. Here's a broad answer:

In a practical sense, if you're purchasing a system...

• An AMD based system may be less expensive for the same performance as an Intel system.
• There exists a greater selection of Intel based systems.
• [*soapbox alert*] Both companies excel at avoiding apples-to-apples system comparisons through the use of arbitrary naming schemes and dizzying array of product models.

In a practical sense, if you're building a system...

• There exists a greater selection of Intel motherboard vendors.
• There exists a greater selection of Intel heatsink vendors.
• Personal experience: Intel processors on Intel motherboards yield more stable and longer lasting systems. All of the AMD systems I've built have succumbed to motherboard failure and one even caught fire when a capacitor leaked.

In the technical sense...

• See www.neeyik.info - AMD & Intel CPU Specifications or AMD's and Intel's processor datasheets at their websites.

If you're trying to make a decision, post your specific quandary.

Intel is more powerful,
Amd is less expensive.