Everyone has heard of complete protein, but vegans probably hear it more often than the rest of the world.
I think the first question many people have when someone mentions a vegan diet is wondering how you will meet your protein requirements.
Ultimately, the best answer is to respond, "Which amino acid are you referring to?"
Proteins are made up of amino acids. Our bodies produce some of them on our own.
Essential amino acids are the ones that our body can not synthesize without the help of the food we eat.
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Complete protein means that all 10 of the essential amino acids are present in our diet.
Source: Veganomicon by Moskowitz & Romero