The future tense in Hindi grammar is used to express actions or events that have not yet occurred. It is important in conversation and writing to convey plans, promises, and predictions. It consists of two forms: the simple future tense and the future continuous tense. The simple future tense is formed with the verb stem followed by the future tense auxiliary verb, while the future continuous tense is formed by adding the present participle to the auxiliary verb. Learning and practicing the future tense is essential for immersion in Hindi and effective communication.