Confused about loans

[Jennyollio]

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I'm getting very confused about loans. I already have done FAFSA and was given my award of Stafford and Perkins loans, but that did not cover the entire expected cost of attendance. So I filled out the form at the schools website for the Federal Direct PLUS loan. Isn't this a grad PLUS loan or is it something different? Because browsing on SDN people are talking about what lender to use, etc. I thought it was just a type of federal loan with a higher interest rate than the Stafford, and that this one is usually the next one to use after Stafford. Am I supposed to be filling other forms out too?