How does CASB prevent cloud data breaches? Are there better alternatives to protect cloud data?

How does CASB help with protecting cloud data? 

Is this the most effective means of preventing cloud data breaches? 

Should one invest in other solutions in conjunction with a CASB?

Find out what your peers are saying about Cisco, Netskope, Bitglass and others in Cloud Access Security Brokers. Updated: November 2020.
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