Target's CEO and President Gregg Steinhafel resigned from the company today, just five months after a data breach ensnared millions of Americans' personal data.

While it's unclear how much that played a role in his departure, it does point out that leading a major retailer isn't just about increasing sales, anymore -- you have to make sure your company is ahead of cyber criminals.

For a look at how companies like Target are shifting their priorities to be stronger against cyber crime, we're joined by Danny Yadron, cybersecurity correspondent for the Wall Street Journal.