Short and simple, it's when some data is accessed by an outsider. The data can be personal or commercial, and both individuals and businesses can be affected.
This refers to information that can be used to identify an individual, such as: full name, date of birth, home address, email address, telephone number, financial details and other personal information; information about companies, their work spheres, products, financial status, transactions, etc.
Sometimes data breaches are unintentional. They may occur due to a low level of data protection in a company, software failure, outdated equipment or lack of staff expertise.
Sometimes these can be deliberate attacks with the aim of stealing data and using it for personal purposes.
A data breach is not a pleasant event. Personal data such as names, addresses, phone numbers and financial information can be used by criminals to commit fraud and even identity theft. The simplest example is taking out a microloan in someone else's name. Data breaches also have unpleasant consequences for companies, such as loss of customer confidence, financial losses and violations of data protection laws.
If you would like to know more about security measures which should be taken to reduce the risk of a data breach, check our other articles.