Whether you are applying for a passport for the first time or want to renew your passport, visit https://travel.state.gov. You'll find exactly what is needed to apply for your passport in person or online, such as forms, additional documents needed, how to calculate your fees and how to take the correct picture.
Not sure what forms you need? Click on the tab labeled "Passport Wizard" for helpful information. Routine processing time is 6-8 weeks, and the expedited process is 2-3 weeks.
For additional safety while traveling,enroll in STEP, a free service that lets the State Department know you're in a foreign country if there is an emergency.