How many times should a woman go for antenatal?

I'm curious to know, how often is it recommended for a woman to attend antenatal appointments during her pregnancy? Are there specific milestones or stages where these visits become more crucial? And, does the frequency of these appointments vary depending on the health status of the mother or the baby? Understanding the importance of prenatal care, I'm eager to gain insights into the optimal number of visits to ensure a healthy and smooth pregnancy journey.