Preventable describes something bad that could have been stopped from happening if the right actions had been taken. When doctors say a disease is preventable, they mean people can avoid getting it through vaccines, good hygiene, or healthy habits. When a teacher reviews a careless mistake on your math test, she might call it preventable because you could have caught it by checking your work.

The word often appears when examining accidents or problems after they occur. If a house fire started from a candle left burning near curtains, investigators would call it a preventable tragedy. If a student fails a test they never studied for, that's a preventable outcome. The word carries a slight sting of regret: it points to what could have been different.

Understanding what's preventable helps us make better choices. Brushing your teeth prevents cavities. Wearing a helmet prevents serious bike injuries. Backing up your computer files prevents losing your work. When something goes wrong that was preventable, it's frustrating, but it can also teach us what to do differently next time. The key is recognizing the warning signs and taking action before the problem occurs.