Will is a modal verb in English with multiple meanings:
1. Used to express future tense: "I will go to the store tomorrow."
2. Expressing willingness or determination: "She will not listen to advice."
3. Indicating habitual behavior: "He will sit there for hours."
4. As a noun meaning a legal document: "My grandfather left me his house in his will."
5. Expressing capability: "This car will hold five people comfortably."