Are you searching for a new job or career change? If you are or planning to in the future then it's very likely that you will come into contact with a number of very different individuals, from a number of different companies all working in different levels of management. No matter who it is that you are dealing with, it is important that you remain polite to people at all times. A helpful way to understand how important been polite is, is to place yourself in the other persons position, as an example imagine you were the one searching for a new employee and you had two applicants to interview. One of which responded with "please" and "thank you" while the other just spoke to you as if the whole thing was a waste of time, which individual would you go for? It's most likely that you would pick the polite and well mannered contender. Generally employers want courteous and polite people as their employees.
A first-rate polite employee can help a business grow. This is very true when direct customer contact is required as part of the job. As an example in the retail area an employee with a terrible attitude can cause distress to the customers who will in turn take their custom elsewhere, where as a kind polite employee will make the shopper feel good and happy with the company. That is the same reason why it is vital to be polite when dealing with all potential employers as they will be looking at how you interact with people, no matter which type of industry you are interested in working for.
When you apply for a job its important to be polite at all times and not just for the interview, this is a mistake loads of job seekers make as they believe the only person they need to impress is the interviewer. This is a big mistake because after you have left the interviewer may well ask other people such as the receptionist about your attitude. It is also very important to be polite when talking to anyone over the telephone as you might not be aware of who it is you are chatting to, or how well they know the management. to summarize whether you are talking to a secretary or head manager you should always remain polite and courteous.