The patent opposition system under the Indian Patents Act, 1970, is crucial for ensuring that only valid patents are granted. It provides a mechanism for third parties to challenge patents during the pre-grant and post-grant stages. This process allows objections on grounds such as lack of novelty, inventive step, or industrial applicability. Patent opposition ensures that patents granted in India meet the required legal standards, maintaining a fair, transparent, and efficient intellectual property system while protecting the public interest.