For iPad and iPhone
If you have an iPhone or an iPad (even an Apple Watch) – there is an important security update that I just got notice of on Friday. It is known as iOS / iPad OS 14.4.2. This update fixes a critical flaw in Web Kit. Web Kit is the engine that powers Safari (all the website browsing you do) on those devices, along with any apps that might render parts of websites. Without Web Kit, the iPad / iPhone does not function. This update covers the iPhone 6s and later and iPad Air 2 and later. Even though Apple is not updating the iPhone 6 and original iPad Air anymore, Apple did you a real favor. They have issued an OS 12.x update for these 2 as well so that you have the Web Kit fix as well.
Settings >> General >> Software Update. Get Updating!