Flash was used to construct interactive graphics between 2008 and 2012. To see these graphics play Adobe Flash Player needs to be installed and enabled.

Because Flash is a security risk, Chrome enables you to enable Flash for only those websites you trust.

Why Adobe Flash is a Security Risk and Why Media Companies Still Use it
Adobe will finally kill Flash in 2020
Flash Player Help - Install Flash Player in 5 easy steps (Adobe)
Enable Flash Player on Chrome