Beta is the second letter of the Greek alphabet, but it's most commonly used today to describe something that's almost finished but still being tested. When a video game company releases a beta version of their game, they're letting players try it out before the official launch to find bugs and problems. Software developers often run beta tests to see how their programs work in real situations with real users.

Think of beta like a dress rehearsal for a school play. The show is mostly ready, the actors know their lines, but the director wants one more practice run to catch any last issues before opening night. A beta version works the same way: it's functional enough to use but might still have glitches or features that need improvement.

You might hear people say a website is “in beta” or that they're “beta testing” a new app. Companies value beta testers because they use the product in ways the creators never imagined, discovering problems that need fixing.

Today, beta is used beyond just technology. Someone might jokingly call their first attempt at a new recipe a beta version before perfecting it.