The California Department of Motor Vehicles begins accepting applications today for "Real ID" driver's licenses and state identification cards. These are licenses and IDs that will be required to board a domestic flight, enter federal buildings and visit military installations starting in 2020.

Here's what Californians need to know about Real ID licenses, how to get them and how necessary they will be.

Q: What is a Real ID driver's license or identification card?

It's a license or ID that is compliant with the Real ID Act, a law passed by Congress in 2005 following 9/11 that sought to create standardized driver's licenses in all states. The law established certain national security requirements for these state-issued documents.

Beginning Oct. 1, 2020, travelers boarding domestic commercial flights, entering a military base or using their ID for other federal purposes will need to present a Real ID-compliant driver's license or state ID card.

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While non-compliant licenses or IDs won't be accepted, people can present other federally compliant documents, such as a passport, passport card or military ID for taking flights and other federal uses.

Q: Is obtaining a Real ID license or identification card necessary?

No, it is not. "A Real ID driver's license or ID card is optional," said DMV spokeswoman Jessica Gonzalez. "It is just an easier way for you to continue using your driver's license to board a domestic flight. That is really the main part of it."

Californians who don't wish to obtain a Real ID license or state identification may apply for what's called a "federal non-compliant" driver's license or ID card. The card will be marked with the words "federal limits apply."

Californians who choose this option may continue to use their state licenses to drive and use them as they do now. But they won't be able to use them starting in 2020 for taking a domestic flight, for example. If they don't have a Real ID license or identification card, they'll need to present a passport or other approved document to fly.

Q: How does this affect AB 60 driver's license holders?

According to the California DMV, the changes don't apply to the nearly 1 million immigrants who have driver's licenses under AB 60, the law that allows unauthorized immigrants in the state to apply for the licenses. According to the DMV, only people who are legally in the United States may apply for a Real ID license or identification.

"If you already have an AB 60 driver's license, when it is time for you to renew, you can just continue to renew by mail, or online as normal," said the DMV's Gonzalez. She added that AB 60 license applicants' information will not be shared with the federal government.

Q: Must those who want a Real ID license apply right away?

No, there is no rush, according to DMV officials. Until Oct. 1, 2020, a valid California driver's license may still be used to board a domestic flight or to enter a secure facility. Today is simply the date that the Real ID option becomes available to California residents.

Q: How do I apply?

Those wishing to apply for a Real ID license or identification card must do so in person at a DMV office. Applicants must make an appointment and come prepared with proof of California residency, proof of their Social Security number, and proof of identity such as a U.S. passport, a birth certificate, an employment authorization document, a permanent resident card (green card) or a foreign passport with an approved form I-94 arrival and departure record. The DMV has posted a list of documents that Real ID applicants may use.

The cost is the same as for a regular California driver's license, $35. The cost is $30 for state ID cards. DMV officials said the processing time should be about four weeks.

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What You Need to Know About California 'Real-ID' Driver's Licenses