WHAT IS PROTIC ACID

An acid (from the Latin acidus meaning sour) is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a hydrogen ion activity greater than in pure water, i.e. a pH less than 7.0. That approximates the modern definition of Johannes Nicolaus Brønsted and Martin Lowry, who independently defined an acid as a compound which donates a hydrogen ion (H+) to another compound (called a base). Common examples include acetic acid (in vinegar) and sulfuric acid (used in car batteries). Acid/base systems are different from redox reactions in that there is no change in oxidation state. Acids can occur in solid, liquid or gaseous form, depending on the temperature. They can exist as pure substances or in solution.

Chemicals or substances having the property of an acid are said to be acidic

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acid which contains Hydrogen eg: HCl , H2SO4 etc.

A protic acid is one which can easily provide protons.or for that matter,H+...Since there are many definitions for an acid,like lewis acids,lewis base..bronsted and lowry theory etc...(go through your reference book,this portion should be understood well)..Hope you understand :)..Reply if you have doubts 

Protic acids are compounds that can loose easily a positive hydrogen(proton).

Examples are HCl, H2SO4, HNO3.

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