ね is a sentence-final particle that turns a statement into a question seeking agreement or confirmation. It is very common in everyday conversation. When you say 今日は暑いですね, you are not asking for new information but expecting the listener to share your feeling. It can soften a statement, making it sound friendly and inclusive, like saying 'right?' or 'isn't it?' in English.\n\nね can also be used when you are confirming something you already know or when you want the listener to agree with you. For example, if you see a friend and say 元気だね, you are affirming that they look well and expecting them to agree. The pitch rises at the end, similar to a question, but the meaning is more about seeking agreement.\n\nIn informal speech, you can use ね after plain forms, like 暑いね. In formal speech, you add it after です or ます, like 暑いですね. This particle is a hallmark of natural Japanese conversation, and learners often use it too much or too little. Using it appropriately makes you sound friendly and engaged.