The guideline on saturated fat is a proportion rather than a fixed amount: keep it under 10% of your daily calories. For a typical 2,000-calorie day that's roughly 22 g, though the exact figure shifts with how much you eat.
Fat itself is essential, and saturated fat isn't something to eliminate. The reason for the ceiling is that a consistently high intake is associated with raised LDL cholesterol. LDL, or low-density lipoprotein, is the type often called "bad" cholesterol, because when there's too much circulating, the excess tends to build up in your artery walls, and that buildup is what's linked to cardiovascular risk over the long term.
It also adds up quietly, since it's concentrated in fatty and processed meats, butter, cheese and full-fat dairy, and many baked and fried foods. US national survey data (NHANES) suggests around 66% of people take in more than the recommended limit. Swapping some for unsaturated sources like olive oil, nuts, and fish is the usual way to bring it down.