the short answer
Body recomposition is building muscle and losing fat at the same time, rather than in separate phases. You eat at maintenance or a slight deficit, keep protein high, and train for hypertrophy with progressive overload. It works best for beginners, lifters returning after a layoff, and those with higher body fat - and is slow for lean, advanced lifters.
This article is general fitness and nutrition information for coaches and lifters, not medical or dietary advice. Individual needs vary - judge any approach against the person in front of you, and refer medical or clinical questions to a qualified professional.