When I think of a tostada, I don’t think of tortilla chips. I think of a whole fried or toasted tortilla (almost exclusively corn tortillas) with toppings - usually refried beans, maybe corn and/or whole beans, maybe diced onions or scallions, almost always diced jallepenos, and the whole mess covered with melted shredded cheese. Shredded meat may be added, sometimes.
Dorritos (‘little bits of gold’) are a brand name of tortilla chip, and are pretty much an American abomination.
And, now that I think on it, if I asked someone to bring me some “tortilla chips”, I would be a little surprised if they showed up with Doritos or other flavored snack items. I wouldn’t think that they’re an idiot, but a bit déclassé. I like Doritos, but Doritos are Doritos and tortilla chips are tortilla chips. 
I would have been expecting unflavored chips perfect for dipping into salsa, guacamole or queso.
Amen.
This, except that I’m completely unfamiliar with the potato/egg dish from Spain. It sounds yummy, but I’d never heard of it before this thread.
I grew up in Texas and now live in southern California.
ETA: I like Doritos, but don’t consider them tortilla chips. They are their own variety of goodness.
Tortillas are thin flat bread made from cornflour or wheat. Traditionally formed and/or cooked on a flat piece of limestone. Tortilla chips are fried pieces of tortillas, though often the packaged ones are machine made in the form you get them in.
If you are eating store bought tortilla chips, you have no idea what the real thing tastes like. Wheat tortilla chips fried to a golden brown are incredibly delicious.
What everybody else said about Tex-Mex. I am aware that there is a Spanish dish with that name, but since I don’t really care much for Spanish food, I have never tried it.
If you don’t make your own or have a taqueria close by, you don’t know the true wonderfulness of a tortilla.
T’ch. You’re missing out on a LOT of great food. Give it another try.
No doubt. Not saying I actively dislike it. It’s just not way up on my list of “Foods I Must Eat.” Too many other things of interest, and to my knowledge there aren’t (m)any Spanish restaurants around my locale. I’ll survive. 
Sorry…I am talking about those whole wheat monstrosities…
This. I’ll add that tortillas may be flat and brittle and crunchy, or they may be soft and foldable. And that, in my experience, tortillas (though not tortilla chips) are invariably circular in shape.
Never heard of this.
I would call the crispy ones tostadas. Is that incorrect?
I should add that I would probably refer to the potato/egg tortilla as Spanish tortilla, unless I was in Spain, where i could just call it tortilla.
I should also add that in the UK, a lot of people don’t get the double L right.
The double L has the same sound as y in the word “yellow”
So Amarillo is not pronounced Ah Mah Rill Oh (except by Texans); it is pronounced" Ah Mah Ree Yo"
So why doesn’t Spanish just spell it Amariyo?
Probably for the same reason we don’t spell “Knife” and “Knight” “nife” and “night”…LOL
Are you saying the Ls used to be pronounced if you go far enough back?
Stealing from reference.com:
galleon
1529, from O.Fr. galion, from Sp. galeón “galleon, armed merchant ship,” from Byzantine Gk. galea “galley” (see galley) + augmentive suffix -on.
So I am thinking yes, but we are off topic again…sorry Mod…Sorry OP…
Since this is off-topic, it’s the last I’ll say about it, but, yeah, I could see how that could happen. I can imagine someone, perhaps someone who talks fast or doesn’t enunciate carefully, saying “a million dollars” so that it sounds like “a miyon dollars”; so that, over time, “ll” could morph into “y.”
To WhyNot: I think of a tostada as having something on it. But, at least according to Wikipedia, the word could refer to either just the tortilla or to the tortilla with stuff on it:
And in other areas, a “tostada” is basically a piece of toast.
A piece of toasted tortilla with yummy stuff on it! 
A tortilla is a thin, flexible flatbread that can be used to wrap a burrito or other wrap. Fry it crispy, and it’s either a tostada (if it’s still a full intact round) or chips/corn chips/tortilla chips/whatever if cut into bite-sized strips or wedges. Or a taco shell or taco salad bowl, if shaped appropriately before frying. A tostada will usually be served with toppings on it, but the tostada itself is the crispy bread used for the base.
I also know of and have had the Spanish egg dish (it’s sort of like an omelet, but much firmer), but it would certainly not be the first thing I thought of on hearing “tortilla”.
+1