Hi Makayla!
Thanks for your question. When you stay at a resort at
Walt Disney World, your stay is based on
number of nights of your stay. For instance, if I stayed at
Disney's Contemporary Resort for 3 nights, the package would say "3 nights, 4 days." My departure date is also considered a day, because I'm still entitled to any amenities the resort offers (pool, activities, etc.) up till the check-out time of my departure date, which is 11:00AM at this writing.
Walt Disney World
theme park tickets come with a number of different options. A base 3-day "1 Park Per Day" ticket would be choosing only 1 park for a specific day. That could either be 3 separate parks each day, or, if you love one theme park a lot, choosing the same park for all 3 days. For a slightly added cost, however, you can add the "Flexible Dates" ticket option, which you can use either
during your resort stay or afterwards (typically tickets with the Flexible Dates ticket option are valid till the end of the next calendar year).
So if you had a 3-day park pass with a 3-night, 4-day resort stay, you can use your 3-day ticket passes for any one of those 4 days.
Thanks again, and have a Mickey Magical Day!
Terry