A pillbox has lots of small compartments to organize your pills for each day of the week or month. A pillbox can help you or a caregiver keep track of which medicines you need to take. If it's the end of the day, and you see a pill in the compartment for that day, you likely forgot to take a dose.
Be sure to leave at least one pill in the original bottle. That way, if you forget what a pill is for, you can find it in the bottle it came from. A few medicines must be stored in their original containers so that they don't spoil. If your medicine label has this instruction, then don't use a pillbox for that medicine.