There are a number of different types of interviews. In some cases, you'll only need to succeed at one of these to land the role.
Face-to-face:
The traditional and still most common form of interview. You'll attend the employer's office and be questioned on your suitability for the job by an individual or panel. Face-to-face interviews usually last between 45 minutes and two hours and may be preceded or followed by tests and exercises. The questions may be strengths-based or competency-based.
Telephone:
Most often used by employers early in the application process to filter large numbers of applicants down to a more manageable number. If you're successful you'll typically be invited to a face-to-face interview or assessment center. Expect a telephone interview to last around half an hour.
Video:
Increasingly popular among large employers, and even more so during the CV-19 pandemic. Video interviews can be live or pre-recorded and will tend to last around half an hour.