Answer:
Two ways to redraw districts are:
Packing - in which one party's voters from several districts are squeezed into one district to minimize their voting power in other districts. This is often done by placing voters of a particular party in a single district to reduce their influence in surrounding districts.
Cracking - in which a district having many supporters of one party is divided into smaller districts to dilute their voting power. This is often done by dividing a district with a concentration of voters from a particular party into several smaller districts with more mixed political affiliations.