The hashtag #NSFW stands for "Not Safe for Work" and is used to indicate content that is not appropriate for viewing in a professional or public setting. It is typically used to warn others that the content may contain explicit, adult-oriented, or sensitive material that could be considered offensive, graphic, or explicit in nature. The purpose of using the #NSFW hashtag is to provide a clear signal to users that the content may be explicit or contain adult themes, allowing them to exercise caution before accessing or viewing it. It is commonly used in online platforms, forums, or social media to help users make informed decisions about the content they choose to engage with.