There are lots of articles, both on and separate from Intel's web site (try Wikipedia) that go into depth on how the Turbo Boost feature works.
Hope this gets you started,
Your processor supports Intel Turbo Boost Technology. This future will automatically increase the processor performance (work frequency) for peak demands. All this without exceeding the thermal limits. You may disable or enable Intel Turbo Boost Technology in BIOS settings. No need to install any software. More information in Overview Information for Intel® Turbo Boost Technology.
Overclockers are actually modifying (increasing) the base clock speed (which is static for Turbo Boost), playing with voltages, etc., all in an attempt to get more out of the processor. It's really not worth it these days.