The pour plate and spread plate are two methods to plate the colonies on or with the media.
In pour plate you pour the media over the inoculum of the culture and is slightly mixed, ensuring overall distribution, the colonies grow in all the media,
While in spread plate a spreader is used to spread the culture over the media on the plate, it gives you the colonies growth on the surface only as compared to the random overall growth in pour plate.
The colonies that now grow can be used for the isolation of an axenic culture that is pure culture of a specie.