Well, what's not freestyle?
It's whenever you have a fixed system to regulate how you cycle pieces. In Pochmann, M2, or R2, it's a constant 2-swapping alg. In 3OP, you somewhat freestyle, but you orient first, so it's easier to figure out what goes where.
In pure freestyle, you simply resolve cycles:
"This goes there, goes there, that edge needs to be oriented, and that's it." You memorize everything you need to do in order to cycle pieces into their place, and cycle them with whatever means as efficiently as possible,
frreestyle.
In practicality, this reduces to 3-cycling stickers + some miscellaneous stuff (2-cycles, orientation, parity).
It can also be with or without a simplifying buffer (which makes it faster but longer); I use UF, some use UR (as in old Pochmann), Chris Hardwick supposedly uses UB, and Rowe uses no fixed buffer...
(3OP has no buffer, but pre-orientation makes things much easier, so it's a significant choice in freestyle).
For more examples, look through this subforum...
