Most average gym goers will use a Linear Periodization model. The Linear plan sets the goal of lifting more weight by the end of the year. Each Mesocycle is designed to be an increase in weight, reps, or intensity.
Sports athletes are better served by following either a Non-Linear Periodization model or a Block model. The Non-Linear model works well for athletes with short seasons, or are multi-sport athletes with different demands throughout the year. This model combines different training goals into each Microcycle, such as working both strength and power in the same week. The Block model is for athletes with longer seasons or multi-sports with similar demands. Here, each Mesocycle is matched to a specific training goal. For example the month leading up to in-season training will focus on endurance, so you can maximize your practice times. In-season training months may be split into a month of high volume low rep weight training, and a month of power training. By dividing up your training into specific monthly blocks, you are able to reduce fatigue on your body with the constant switches in intensity. This allows for you to remain at peak performance longer.