Cyberworthiness is like taking care of your toys. Just like you need to make sure your toys are safe and working properly before you play with them, cybersecurity experts need to make sure electronic things like computers and phones are safe and working properly before people use them.
This means checking things like the software (the computer programs that help the electronics run), making sure there are no "bugs" (glitches that can make things not work right), and protecting them from bad people who might try to do bad things with them.
It's like putting a protective shield around your toys to make sure they don't get broken or damaged. Cybersecurity experts work really hard to make sure electronic things are safe and can be used in a way that doesn't hurt anyone.