Q:

What type of switch is this? 

I need switch which is normally closed, but when I press it, it goes to off state.  As soon as I move finger from it, it must go to default state (normally closed).  Which type of switch is this?  I need two of them, for limit switch control of DC motor when it reaches full travel in either direction. 
Thanks in advance

A:

You need a limit switch (often called "Microswitch") - this type of switch is designed to be controlled by things, rather than directly by a person.   Most such switches are single pole, double throw (SPDT), so they can be used as either normally open or normally closed. 
Limit switches are available as pushbuttons, or with various lever or roller actuator arms.