The best option is always face-to-face interview although there are times when personal meeting is simply not possible. As always other options exist such as telephone, video conference or an interview via Skype™. Something used to considered to be not very professional nowadays is becoming more common than ever and widely used.
Should you ever find yourself having to use Skype™ when interviewing for a job please take a moment to watch the following video in order to avoid the most common mistakes people make when using the above mentioned Microsoft software: