Kopec Explains Software
Computing concepts simplified

#91 PayPal's Early Innovations

Payment by email and cutting edge fraud prevention.

Today we know PayPal as a financial powerhouse. But when it was a young company, it had to innovate to survive. PayPal was the result of the merger of two startups—Confinity and X.com. Confinity was trying to be a digital payments solution for Palm Pilots, while X.com was an early online bank. PayPal first found success as a conduit for eBay payments. But perhaps PayPal's greatest innovations were in the area of fraud prevention. PayPal was a pioneer of bank account verification, CAPTCHAs, and using machine learning techniques on big data.

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#90 Binary Search

One of the most fundamental algorithms in computer science.

#89 Multi-Touch

Where did it come from and how has it changed software?

#88 Human-Computer Interaction

The study of the interface between human and machine.

#87 Compilers and Interpreters

How does source code become machine code?

#86 Tim Howes

An interview with a software luminary.

#85 The End-to-End Encryption Debate

Who should see our messages?

#84 What Is Blockchain?

The underlying technology of bitcoin is not that complicated.

#83 Why Was the iPhone's Software Revolutionary?

It wasn't the first smart phone, just the most important.