Sometimes we just need to know client web browser to deliver information or add some code specific to the browser. In a client web browser navigator object holds client browser name,version, user agent,platform and other details.
We sometimes need to validate the integrity of given email id. The easiest way we have is just sending a verification mail to the given email id and asking the user to click on the link in that email. But other than that we have three more ways, that is, SMTP Email Validation, MX Record Check and Regular Expression&