The Song of Songs is a poem or a series of poems that celebrate love and intimacy between a man and a woman. Jews traditionally have interpreted the book as a picture of God's love for His people Israel. In the same way, many Christians interpret it as a picture of love between Christ and his bride, the church of all believers.
The first verse of the book ("The Song of Songs, which is Solomon's") gives the idea that King Solomon of Israel wrote it. However, people have interpreted this verse in different ways, so not everyone is persuaded that Solomon wrote it.
This book is traditionally titled "Song of Songs," which means the very best song, or "Song of Solomon." It may also be called "Songs of Love," "Great Poems of Love," or "The Love Songs of Solomon."