Two genuinely different structures are hiding in that list.
Structure one: you deed the parcel to the buyer at closing, and the buyer signs a promissory note (their written promise to pay) secured by a mortgage or deed of trust against the land. Title is in the buyer's name from day one. Your protection is the recorded lien. If they stop paying, you foreclose the lien.
Structure two: you keep title and give the buyer possession plus a contractual right to receive the deed once they've paid in full. This is what land contract and contract for deed both mean. They're regional names for the same idea, and you'll also see installment land contract and bond for title. "Installment sale" is looser, and people use it for either structure, so ask which one they mean.
The claim that the buyer owns nothing until the final payment is the part to be careful with. The buyer holds equitable interest, meaning courts in many states protect their accumulated stake, and a number of states require you to foreclose a contract for deed much the way you'd foreclose a mortgage rather than simply canceling it. How much protection the buyer has is state law and worth an attorney's read before you pick a structure.
One practical difference that catches people: with a contract for deed, the taxes usually still bill to you as record owner, so you need a system to confirm the buyer actually paid them. With a deed and note, the buyer gets the tax bill directly and you find out about a delinquency later, sometimes much later.
