Website traffic services send visitors to your URL with a referrer you choose, so in Google Analytics they show up as coming from Google, Instagram, YouTube, Quora, Reddit and others. India-targeted traffic can even come "from" Flipkart, Amazon.in or NDTV.
What it's good for: testing that your analytics and pixels work, making a new site look active, or warming up a domain. What it's not good for: sales — these visitors won't buy anything. If you need customers, run ads or work on SEO.