The "Prayers of the Faithful," also known as the "General Intercessions" or the "Universal Prayer," are a specific part of the Mass.
The Prayers of the Faithful typically occur after the homily (sermon) and the Creed (Profession of Faith). They are the last part of the Liturgy of the Word.
In summary, the Prayers of the Faithful are the final part of the Liturgy of the Word.