Hi friends i just wanted to know is 'comma' plays important role n title of the website for example lets say search pdfs on online pdf search engine and download free pdf also OR search pdfs, online pdf search engine , download free pdf also which one is better
Definitely number 2, if either (although I would drop the "also"). The second one is far more readable - remember your page title is not just for search engines, but for users when they see your page in the search results - it's the main advert for your page. I'd recommend you capitalise it properly too, and make sure it has a good readable page description.