Ads are important in modern day society, ads have helped many websites we use today grow. Without Ads, alot of websites would most likely stay in obscurity to never be as popular as they are today.
We use ads to help grow. This can come in many ways and not just websites, Advertizements can come in person and promote there real life buisness. Advertizements are very helpful for beginners.
Ads have shown again and again to be very effective, but its important to note that advertizing your website or buisness doesnt gurantee sucess. A good example would be Amazon. Due to there huge size, advertizements help them grow more compared to a small obscure website.