As XA said, however -
Do you mean a VFR approach, or and IFR Visual approach?
If VFR -
You are under a control service, so have to follow ATC instructions. ATC will separate you from IFR traffic typically by route and/or level restrictions (eg track via A and B; not above 2000' etc) or, if the weather permits by visual separation (the controller has both a/c in sight & can maintain sep or following a/c has lead a/c in sight & can maintain sep).
Other VFR a/c, you will just receive tfc info, although that could also come with instructions like "join downwind lefthand rwXX. You are no2 to a C172 late downwind left"
*simplified for brevity.
If you mean an IFR visual approach, then you will be separated from everyone.
Rules of exactly how a controller may separate do vary slightly from country to country, however, so your best bet to get things straight in your mind is a visit to your friendly local ATC unit. Don't forget to go armed with biscuits and/or cakes!
AP