Full Body

Many underestimate the Full Body training program and consider it a training program for beginners because it can be applied for 2x /week or 3x /week. Recent studies show that there are many bodybuilders who train full body 6 days a week. The full body program can be applied in combination with other training programs such as PPL3x and full body 1x with 4 days per week or with Upper / Lower Body 2x and full body 1x with 3 days per week.
Push/Pull/Legs

I think it is the most common program for intermediaries with a training program of 6x / week. As the training style says on the first day, there are push exercises, the second day pull exercises and the third day leg exercises.
Upper/Lower Body

Like the Full Body, the Upper / Lower body training program is assigned to beginners who want to train 2 days a week. It can be used successfully for those who want to train 3 days a week with a Full Body day and for those who want to train 4 days a week repeating the formula Upper / Low rest Upper / Low.
Bro Split

Bro split is and has been used by many bodybuilders. These programs divide muscle groups into a 6-day-a-week training program. The latest studies on muscle growth show that a muscle group must be worked twice a week to optimize muscle mass growth and therefore many have opted for other alternative programs or have divided 2 muscle groups per workout per day and thus achieve the same muscle group 2 times a week.