well known

adjective
1
known about by a lot of people
مشهور, معروف, نام‌آشنا, شناخته‌شده, پرآوازه
synonym famous
2
generally known and accepted
شناخته شده, مشهور, معروف, سرشناس, نامدار
It is a well-known fact that caffeine is a stimulant.