Used to describe the purpose or reason for an action; 'for the sake of', 'in order to', 'because of'.
Long explanation:
The ために (tame ni) grammar point is used to express either the purpose of doing something, in which case it translates to 'for the sake of' or 'in order to', or the cause or reason for a situation, in which case it translates to 'because of'. To form it, simply attach ために to the verb, adjective, or noun that describes the purpose or reason.