In archtectural plans: there are plans, sections and elevations
Think of a loaf of bread instead of a house.
Slice the bread horizontally and looking down, you would see a plan. It is not exact to call it just the floor, because they usually contain windows and openings above the floors.
Slice the bread vertically (like they normally are) and you have sections. These are helpful to see how far off the floor your windows will be, ceiling height and door height. You can also see how wide your doors will be.
Elevations are flat views of usually the exterior, but can be interior too. The one thing that is strange about them is that they have no depth to them. They are measurably exact, but not visibly (we can't even see that way!) It would be like taking the bread and moving a slice forward or backward from the loaf, and then, if drawn would still look like a loaf of bread.
In order to read your elevations, you have to see the plans to know at what point the elevation has a shift forward or back from the front of the house. For instance, garages are often not flush with the front of the house...
If you want...you can build a rough model.
Make copies (!!!!!!) take your elevations and a set of plans and get ready to cut.
Your elevations should match your plans in length.
l ............ ........ l
l ............ _____l
l ......... .. l ....... l
You can see where the garage is, but if you cut it out, it sits further back than the front, but it will dimensionally be the same...(roughly).
Washington University in St. Louis, Masters of Architecture