Instagram is a highly popular social media platform that is optimized for mobile use. It provides great engagement opportunities for brands, with users being 4.21% more engaged on Instagram than other platforms. The document then provides tips for growing an Instagram account, such as posting regularly, using relevant hashtags and captions, engaging with the Instagram algorithm, and leveraging new features like Reels which allow for 15-60 second video clips similar to TikTok. Reels provide an opportunity for organic growth on Instagram without needing a separate TikTok account.