Getting a job today is quite different from say a decade or two ago. Today, depending on the job profile that you are looking for, you may have to go through an interview process. Everything related to the job interview process depends on the post that you are looking at.

Here is a brief description of the main four job interview stages:

Job Interview Process: Stages of an Interview Process

First interview – Initial face to face Interview or Phone Interview

This is the stage where the company informs you about the job position vacant in their company, or where you apply for the said post in their company. In any case, during the initial interview, the company tries to get any professional information about you and gauge whether you fit the requirements of the company. In case the company and you are situated in geographical locations that are far away, this can even be a phone interview. In the case of a phone interview, the interview is placed on a time that is mutually acceptable by both parties. During this, the company requires you to give the relevant information about your professional past.

Second Job Interview –2nd interview tips

The 2nd job interview step is a technical interview. If you have received a call for the second interview, you can be sure that you have a very good chance to be employed for the job. The second interview will basically have you meet with the department head, or the individual in the company whom you would be reporting to. This is more of an interaction between two professionals than a job interview. If all is well, the individual will share with you your job responsibilities, and will try to know more about your professional skills and whether you fit the bill about the responsibilities that he or she has in mind for you.
A tip for the 2nd interview: You may be interviewed by your new teammates. This type of interview is called a team interview and is based on team questions related to your professional knowledge and competency based skill.

Third Interview – the 3rd interview: HR interview, Salary Negotiations

If you cross the second interview, you can be sure that you are almost employed with the company, barring some aspects that need to be cleared out – most importantly the financial part of it. The third interview will be a joint interview with the Human Resources Department as well as the Accounts Department. Individuals from these departments will inform you about the rules and regulations that have to be adhered to by the company and therefore, rules and regulations that have to be adhered by you. You will also be informed about any documentation that is required for you to join the company. Also, the third interview is basically a bargaining interview, where the company informs you about the intent to hire you and the financials that they have in mind to take you on as an employee. During this kind of HR or accounts interview you will have to negotiate on your salary and other job conditions.
There can be several interactions by you and the company between the third and the fourth interview. These interactions will basically circle around the confirmation of the documentation as well as further communication regarding the financials involved.

Fourth Interview – Getting the Job Offer

The fourth interview is by far the final interview when it comes to job interviews. The fourth interview revolves around your department head confirming that have you have been hired with the company and taking a verbal or written commitment from you about the joining date. The second part of the fourth interview will also have the HRD or the Accounts Department providing you with an offer letter or appointment letter, putting a final sign of the approval on your hiring.
Refer to the article -  salary negotiations and the job offer.

Most of the interviewing processes have the above four stages (and at the same stages order).
You may also refer to the after interview process category.

However, there can be a couple more stages in the interview process depends on the job profile and the nature of the company.
Therefore, for clarifying the interview process, you may quest about it (this is one of your questions to ask as an interviewee) at the first interaction/interview with the company.
Read – Question to ask at a job interview.