Instagram uses a machine learning algorithm to recommend content to users based on their behavior on the platform. The algorithm takes into account a variety of factors, including the user's search history, the accounts they follow, the content they engage with (such as liking or commenting on a post), and the hashtags they use. The algorithm also considers the popularity of content and the recency of posts. For example, if a post receives a high amount of engagement in a short period of time, the algorithm is more likely to recommend it to users. In addition, Instagram has introduced features such as the "Explore" page and "Suggested Posts" to further personalize recommendations. The "Explore" page shows content that is similar to what the user has engaged with in the past, while "Suggested Posts" recommends content from accounts that the user does not follow but may be interested in. Overall, Instagram's recommendation algorithm is designed to provide users with a personalized experience by suggesting content that is relevant and engaging to them based on their behavior on the platform.