The literal definition of a taco is a long cylindrical object.

These, which some call taquitos (little tacos) are actually tacos:



These, which some call tacos, are actually chalupas:



They are called chalupas because of their shape like boats called chalupas.



These, which some call chalupas, are actually tostadas:



I don't know what this is, but some claim it is a chalupa:



And this is just gross:




Thank you for your attention.