Most business executives dub PR as 'free advertising.' This could not be farther from the truth. It neither is advertising, nor is free. As a matter of fact, it may be costly, VERY costly, depending upon how it is used, because it's a time consuming and labor intensive process. Still while it almost is cliche; today, PR may make the claim that it'll give your business the best return for its marketing budget.
.Public relations works through intermediaries
.Public relations is messy
.Public relations is personal
.Public relations builds up credibility
.Public relations is based on relationships
.Public relations is opportunistic
.Public relations is not free advertising
Could you please specify which kind of website? A product page? A service? Company? Blog?
I could just give you an answer which I think applies to all of these pages: High quality content.
In SEO at least, content is king. If you have high quality, relevant content linking to your page, it will most likely get read and possibly even shared. This would be the closest thing to “instant” traffic.