The Book of Philippians is a letter in the New Testament of the Christian Bible, written by the Apostle Paul while he was imprisoned. It is addressed to the Christian community in the city of Philippi, which was one of the first places in Europe where Paul preached. The letter emphasizes themes of joy, unity, and perseverance in faith. In Philippians, Paul encourages the believers to live in harmony and to rejoice in all circumstances. He also expresses gratitude for their support and shares his personal experiences, highlighting the importance of humility and following the example of Jesus Christ. The letter is known for its uplifting message and practical advice for daily living.