Intercession is prayer that pleads with God for your needs and the needs of others.  But it is also much more than that.  Intercession involves taking hold of God's Will and refusing to let go until his Will comes to pass.  You also joining in helping us through your prayers, so that thanks may be given by many persons on our behalf for the favor bestowed on us through the prayers of many 2 Corinthians 1:11.