Difference Between intel i3 , i5 and i7 Processors

Well Thats Been  always the Most Searched Topic on Google Since the Launch of i3 , I5 and i7 Processors in 2009 .  Many Websites Are Explaining the Difference Between These Processing Giants But Still Most of The people Dont Exactly know the Differnce Very Well .
This Might Be Because all the Three Processors are Differentiated by Their Clock Speeds , Frequencies , Running Capabilities Etc Which are only Better Understood by Techies and geeks .
We Would Like to Share the Same Difference in a Little easy and Comprehensive Way So that You better know Whats the Real reason for You to choose a Particular Processor.

Before really Starting we Would Like to Introduce Some useful Definations :-

1. HYPERTHREADING :- Hyper-threading (officially Hyper-Threading Technology, and abbreviated HT Technology, HTT or HT) is Intel's term for its simultaneous multithreading implementation in its Atom, Intel Core i3/i5/i7, Itanium, Pentium 4 and Xeon CPUs.
Hyper-threading is an Intel-proprietary technology used to improve parallelization of computations (doing multiple tasks at once) performed on PC microprocessors

2. Clock Speed :-  The clock speed of a CPU is defined as the frequency that a processor executes instructions or that data is processed. This clock speed is measured in millions of cycles per second or megahertz (MHz). The clock itself is actually a quartz crystal that vibrates at a certain frequency when electricity is passed through it. Each vibration sends out a pulse or beat, like a metronome, to each component that's synchronized with it.

3. CPU CACHE :-  A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations. As long as most memory accesses are cached memory locations, the average latency of memory accesses will be closer to the cache latency than to the latency of main memory.

Now Lets Start with The Actual Difference Between all the Three Processors :-
Their relative levels of processing power are also signified by their Intel Processor Star Ratings, which are based on a collection of criteria involving their number of cores, clockspeed (in GHz), size of cache, as well as some new Intel technologies like Turbo Boost and Hyper-Threading.

Core i3s are rated with three stars, i5s have four stars, and i7s have five. If you’re wondering why the ratings start with three, well they actually don’t. The entry-level Intel CPUs — Celeron and Pentium — get one and two stars respectively.
Intel i3 Processor :- 
Uses 4 threads. Yes, it uses hyperthreading technology which is the latest craze due to its improved efficiency over earlier processors that were put on the market.
This processor consists of 2 cores(Some New Editons may have More)
Contains A 3-4 MB Cache
Uses less heat and energy than earlier processors, which is always a good thing in this day and age.
Intel i5 Processor :- 
This is the mid-size processor of this bunch, recommended for those who demand a little speed, but not quite enough where the user will be running resource-intensive applications.
This comes with 2-4 cores(mostly Quad Core), the main difference is that it has a higher clock speed than the Core i3.
This is also a heat and energy efficient processor, but it does seem to be better at this particular job than the Core i3 processor.
The number of threads used in this is no different than the Core i3 with 2-4 threads, and it also uses hyperthreading technology for a boost in performance.
The cache of the Core i5 is bigger than the Core i3, it’s at 3-8 MB.
The Core i5 is where the turbo mode is made available, this provides users with the opportunity to turn off a core if it’s not being utilized.
Intel i7 Processor:- 
This is for the users that demand power, yes it does provide more power and if Tim Allen gets one of these, this would be the beast that he gets his hands on. Great for gamers and other resource intensive users.
The cache on this one is 4-8 MB.
This processor comes with 8 threads, definitely enough to get the job done quickly, maybe even at the speed of light if you’re lucky.  And yes it also utilizes hyperthreading technology.
You will have four cores to take advantage of with this particular series.
And just like the other ones in this Intel series of processors, it is more energy efficient and produces less heat.