Questions about example sentences with, and the definition and usage of "Outdoor"

A: It means outside

A: or an enclosed place

A: I like outdoor swimming pool more than indoor.

If you join this program, there will be a lot of outdoor activities.

A:
The place is ideal for outdoor walks.
Guests can use the parking and outdoor grill.
BBQ with terrace and outdoor seating.

A: Outdoor furniture belong outdoors.

A: Outside means outside of anything
eg Outside the box, outside the bag, outside the car, outside the house

Outdoors means outside of a house or a school or a building. Maybe in a garden or a park or a forest.
eg Go camping outdoors, go play outdoors
eg: My dog is an outdoor dog. He's not allowed inside my house.

A: Outside can me out of the building or out of the room, or on the other side of an enclosed space or figure:

Please go outside (out of the house)
Please wait outside (out of the room)
Do not draw outside of the lines: (Stay inside the lines of the figure when you color it).

Outdoor=outdoors means out of, not in, the house or building.

A: 'outside' can be refered to anyplace outside of the speaker's location(e.g. out of the bedroom→ kitchen), whereas 'outdoor' only means places not under a roof.

A: Outside is general. "I played outside today." Outdoors usually means going from inside a building to outside. "After playing video games, I went outdoors to play sports."

A: Usually we say "outdoors," we don't use "outdoor."

As for the difference, there is no big difference between the two.
I think for most cases they're interchangeable, but I think people would use "outside" more.

"We went outdoors to play." "The cat went outside."

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