What's a Data Breach?
A data breach is the loss or theft of sensitive personal or business information, no matter how it's caused.

Some examples of personal information are your name and address, date of birth, Social Security Number, driver's license number, credit card number, bank account number, passwords, confidential information, etc.

Some examples of business information are your company records, employee records, HIPPA records, proprietary data, passwords, the names and addresses of your clients, their SSNs, credit card numbers, etc.
How Can You Protect Yourself And Your Company From A Data Breach?
First, there's the obvious. Use strong passwords and anti-virus software, lock down your computer equipment and network, limit who has access to important documents, use your paper shredder regularly, change door locks whenever necessary, freeze credit reports if necessary, etc.