What is the difference between Intel Core i3 ,Core i5 and Core i7?

Core i3 belongs to a family of
dual core, 64-bit, x86 CPUs from Intel intended for entry-level desktop and
laptop computers. Introduced in 2010, the Core i3 is the third line in Intel's
Core "i" branding (i3, i5, i7). The Core i3 chips do not include the Turbo Boost feature, which is found in i5 and i7
chips but include Hyper
threading(that allows each processor core to work on two
tasks at the same time for greater multitasking)technology.
Core i3 processors have an integrated GPU and two cores (all generations
including first, second and third are dual core processors)
Core i5 belongs to a family of dual (first generation) and quad (second and third
generation) core, 64-bit, x86 CPUs from Intel, introduced in 2009. The Core i5
chips are the midrange CPUs in the Core "i" line between the
entry-level i3 and the high-performance i7 series. Certain models of the i5
family include the Turbo Boost feature
A family of 64-bit x86 CPUs having quad cores
from Intel that were introduced in 2008 as the successor to Core 2. The first models included a
graphics processing unit (GPU) in the same chip package as the CPU including vastly improved graphics, battery life, and
security—for a zero-compromise computing experience. With key features such as Hyper-Threading Technology,(that allows each processor core to
work on two tasks at the same time for greater multitasking) to the Intel® Iris™
graphics for stunning 3D visuals
and faster, more advanced video and photo editing, the 4th generation
Intel® Core™ i7 processor delivers top-of-the-line performance for your most
demanding tasks.
- Enhanced Memory Control
supporting three channels of DDR3 memory, the
Core i7 contains its own memory controller that runs with a separate clock in
the "uncore" area (a part of the chip that is not executing program
instructions).
- Quick Path and Turbo Boost
a major feature is the Quick Path system
interconnect, which is a high-speed, packet-oriented, point-to-point pathway
between the CPU cores and memory and between the cores and I/O hub. Depending
on the multiprocessor capability supported by the chip model, an integrated
crossbar router between the cores may be included.
The i7 line also introduced Turbo Boost, also available in some i5 models, which allows the speed of CPU cores to be adjusted
The i7 line also introduced Turbo Boost, also available in some i5 models, which allows the speed of CPU cores to be adjusted
In
Short,
Core i3, i5 first gen= 2
core
Core i3 2nd and 3rd gen=2 core
Core i5 2nd and 3rd gen= 4core
core i7 =4 cores
Core i3 2nd and 3rd gen=2 core
Core i5 2nd and 3rd gen= 4core
core i7 =4 cores