Mood: The mood of the video appears to be upbeat and energetic, with a theme of showcasing popular Bollywood music from 2021. The overall emotion evoked is excitement and nostalgia, as the viewer is likely to recognize some of the songs and movies featured. The theme of the video seems to be a compilation of the best Bollywood songs from the year.

Environment: The environment or setting of the video is likely a digital platform, such as a YouTube video or music streaming service, where users can access and enjoy a collection of their favorite Bollywood songs. The setting may also evoke a sense of a music festival or a celebration of Indian cinema.