As more systems move online, it is important for business owners to take measures to protect customer data. All of the software options mentioned in this guide are PCI compliant, meaning they abide by strict security standards for processing and storing financial data. Business owners can also maintain a secure POS system by implementing application whitelisting, keeping software up-to-date, performing regular vulnerability testing, closely monitoring activity, using secure passwords and two-factor authentication, running antivirus software, and hiring an IT professional who specializes in cybersecurity.