One, two motor or manual recline

Single motor recline is the use of one motor only to move both the backrest and footrest together. This means the backrest and footrest are not independently adjustable.
Two motor recline is the use of separate motors and remote functions to adjust the back and the footrest independent of each other.

Manual recline is a chair with no motors to operate the back or footrest meaning the user has to manually make the adjustments.