Opening the bidding with 1NT (one no-trump) shows a balanced hand with 15-17 high card points (HCP). This bid helps your partner gauge the strength and shape of your hand, making it easier to find the right contract. Remember, a balanced hand typically means no singletons, voids, and, at most, one doubleton.
OpenAI. (2024). ChatGPT [Large language model]. https://chatgpt.com/share/0ccf285b-7b9d-4b71-9b5f-fdb4cecf8f93