Seasonality refers to the increases in order demand during finite periods. For a vast majority of ecommerce sellers, the best example of seasonality occurs during the surge in order volume during Q4 (coinciding with the start of the holiday season). However, other brands dedicated to serving a specific time, event, season, etc., might have additional seasonality periods (think Weber grills before the start of summer).
Regardless of which situation aligns with your business, you need to find the balance between overstock and out-of-stock. RestockAMZ can identify sales trends from your own data to ensure you're in stock during peak selling seasons and not overstocked during lower demand periods.