Hi! I am Sahil.Google Adsense is a google product.Adsense gives you money for posting advertisement on your site.I am using google adsense from 2 months.I linked my adsense account with my youtube channel and earned money.If you have enough visitors on your website or youtube channel and want to make money then link your website/youtube channel with your adsense account.you can earn money with your website/youtube channel without spending anything extra. Google AdSense lets place high quality ads on your website/channel with relative ease and without the any hassle earn money.good luck.