a) The Telephone Interview- In today's scenario, telephone interviews are a popular one, because they speed up the interview process and minimise time-wastage. Telephonic interviews are quicker, cheaper, less effort for interviewer and the candidate, reach till long distance, etc.
b) The Face-to-Face Interview- These types of interviews are, by far the most popular and efficient form of assessment. Allowing you to get up close and personal with each candidate while keeping an eye on their body language is far 
more effective than any other interviewing format. You have enough time to build a relationship with interviewer so that you can answers confidently.
c) The Panel Interview- Panel interviews are the same as the individual, face-to-face interviews, but with two or more interviewers in the room. The main advantage of panel interviewing is that it precludes any personal biases that might creep into the assessment process. Each interviewer will pick up on different characteristics, strengths and weaknesses and together (hopefully) make a much fairer judgement.
d) The Group Interview- Several candidates, are present at this type of interview. You will be asked to interact with each other by usually a group discussion. You might even be given a task to do as a team, so make sure you speak up and give your opinion.
e) The Sequential Interview- These are several interviews in turn with a different interviewer each time. Usually, each interviewer asks questions to test different sets of competencies.
f) Competency-Based Interviews- Interviews that require you to give examples of specific skills are called competency-based interviews, or job-specific interviews or skill-based interviews. The interviewer will ask questions that will help them determine if you have the knowledge and skills required for the specific job or not.
g) Formal / Informal Interviews- Hiring managers (when the candidates have proven skills and a renowned name in the field) may begin the screening process with a relaxed, informal conversation instead of a formal interview. This is more of a casual discussion than a typical job interview. On a similar note, a chat over a cup of coffee is another less formal type of job interview.
h) Portfolio Based Interviews- In the digital or communications industry, it is likely that you will be asked to take your portfolio along or show it online. Make sure all your work is up to date without too little or too much. Make sure that your images if in print are big enough for the interviewer to see properly, and always test your online portfolio on all Internet browsers before turning up.