A wide range of hand-push and powered precision seeders are available for small- to large-scale jobs.
Using a variety of actions, they all open the soil, place the seed, then cover it, to create rows.
The depth and spacing is generally adjustable to accommodate a range of crops and the desired plant density; the degree of adjustability depends upon the chosen seeder.
Depending on the device, precision seeders may place only one, or a very few seeds per position.
This is an advantage, in that it saves seed and it avoids crowding, or the need for thinning, allowing plants the space to grow efficiently.