Good quality videos and sound its very important to charm your audience with a wow effect. Whatever is your video presentation, your website, your mobile application or your webinar introduction, adding great video or music make your presentation aesthetic. Please find below some free libraries to search for you perfect content.
Mixkit give you access to free video and music
Unminus give you access to free music
Pexels it’s a library for videos and photos
Youtube give an access to free music and sound effects