How can I effectively overseed sod to improve the density and health of my lawn?

To effectively overseed sod and improve the density and health of your lawn, follow these steps:

1. Choose the right type of grass seed that matches your existing sod.
2. Mow the lawn short and rake away any debris.
3. Use a broadcast spreader to evenly distribute the grass seed over the lawn.
4. Water the lawn regularly to keep the soil moist for germination.
5. Avoid heavy foot traffic on the newly seeded areas until the grass is established.