To entail means to involve or require something as a necessary part or consequence. When a situation entails something, that thing must happen or be included as part of it.

If your teacher assigns a research project, it might entail visiting the library, taking notes, creating an outline, writing a draft, and making a presentation. Each of these steps is required; they're not optional extras. When your parents say a family road trip will entail a long drive, they mean the long drive is an unavoidable part of the plan.

The word helps us think through what's really involved in a commitment or decision. Getting a puppy sounds fun, but it entails daily feeding, training, cleaning up accidents, and veterinary visits. Joining the school play entails attending rehearsals, memorizing lines, and performing in front of an audience. Running for class president entails making speeches and accepting that you might lose.

Adults often ask “What does that entail?” when they want to understand everything that's involved before agreeing to something. It's a practical word for thinking ahead: What will this choice require? What comes along with it? Understanding what something entails helps you make smarter decisions about what you're ready to take on.