The little pots with seeds are tucked away under a clear plastic hood to keep the environment moist and warm, in order for germination to happen. A note if you're using these little jiffy-pots for seed-starting. They have to be soaked first and keep a close eye on them. They tend to "wick away" moisture from the soil.
Another tip: Use seed-starting soil and dampen it first. That way, you don't have to water after you plant the seeds and risk disturbing them. If you keep a lid on the seed-starting tray, you probably won't need to water until you remove the lid once the seedlings appear.
These pots are often promoted as handy because you can "plant them right in the ground." However, once the seedlings have a few true leaves, they need to be re-potted into larger containers with regular potting soil, and then fertilized with a mild solution. But hey, someone gave me these pots so I'm using them.