The readers are the individuals who read the Word of the Lord during Mass. This function, by tradition, has been a ministerial role in the Church, so the readers are able to read the first two readings, while the Celebrant or Deacon reads the Gospel.
Readers should show a reverence for the readings by being properly attired and acting in a manner respectful of their role in bring the first part of the Liturgy of the Word to the congregation.