Success in digital marketing depends on what goal you set at the start. If the goal is to get more visitors, you check website traffic. If it's sales, you track how many people actually buy after seeing your ads. Some people only count likes or followers, but those don't always mean real results. A good measure is how much profit or engagement came from your effort compared to how much was spent. The idea is to see clear growth in what matters most to your business. How would you decide if a campaign was truly successful?