Paracord is a nylon rope, which consists of a central core with a braided exterior. The center core provides tensile strength, while the exterior braids provide protection against abrasion. It has also turned into a cord of buckles & shackles that's been used to fix the Hubble Space Telescope by astronauts during the 83rd Space Shuttle mission.
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A few moments you can only buy Paracord from Military Stores surplus, but today there are many suppliers on the market. Just ensure that if you check Paracord for sale, that there are no other ingredients other than the nylon used in construction and that construction follows the pattern above, and the core is not made of bulk nylon fibers.
There are no actual specifications for paracord diameter but tend to be around 5/32 inches. The power of breaking can also vary dramatically; From about 95 lbs up to 750 lbs. Paracord 550 is named so because it has the power of breaking 550 lbs. Paracord is flexible, it takes an increase to fit suddenly, stretches a little, and then returns to the original length when the load is released.
If you do something outside, you must always pack some paracords in your backpack or day. You can use Paracord as a line to dry wet clothes. Strip to make bootlaces or threads. Use it to keep your food out of animal reach.