Polite Japanese 敬語

There are three basic types of honorifics for verbs. It depends on your 'status' as to which form to use.

A) Humble (丁寧語 teineigo) - This is when referring to oneself or family and (usually) speaking to someone higher up in grade, position or some other criteria for determining status. However even some people with high positions may choose to use the humble form with those under him/her.
B) Normal - This is the standard form of a verb/noun that you use everyday
C) Exalted or Honorific (尊敬語 sonkeigo) - This is what you say to your boss or those higher up when speaking about or to them. If you are speaking about yourself, you will use the humble form.

Humble (speaking to your boss about yourself)	Normal (speaking to your friends)	Honorific / Exalted (speaking to your boss about your boss)
拝見します hai ken shimasu	見ます mimasu to see	ご覧になります goran ni narimasu
申します moushimasu You know this from 'name to moushimasu'	言います iimasu to say	おっしゃいます osshaimasu
頂きます itadakimasu	食べます tabemasu to eat	召し上がります meshi agarimasu
参ります mairimasu This is the humble form for both to come and go!	来ます kimasu to come 行きます ikimasu to go	いらっしゃいます irasshaimasu This is the honorific for both to come and go!
致します itashimasu	します shimasu to do	なさいます nasaimasu

For a more detailed explanation and many more examples see here.