This podcast collectively describe QR codes, their functionality, and the escalating threat of QR code phishing, often called "quishing." They explain that QR codes are two-dimensional barcodes capable of storing various data types and designed for rapid scanning. However, cybercriminals are increasingly exploiting this technology by embedding malicious links in QR codes to deceive users into visiting harmful websites or downloading malware, aiming to steal personal information. The sources also discuss methods for individuals and organizations to protect against these attacks, including verifying the source, using secure readers, previewing URLs, implementing security software, and educating users about the risks.