They are all "locations" in Sprwt, but they are flagged differently and show up in different places:

• Pickup Location (Delivery Settings > Pickup Locations) is a plain hand-off point for meal-prep orders. It has no stock.
• Retail Location (Retail > Retail Locations) is a point of sale that your own kitchen stocks. It has its own daily Retail Menu, on-hand stock per meal and portion, stock alerts and, optionally, Grab&Go ordering.
• Wholesale Location (Retail > Wholesale Location) belongs to a business customer who buys stock from you through the assigned Wholesale Menus (with an optional discount) and then resells it. Wholesalers manage their own stock and Grab&Go prices from the My Wholesale portal on the customer site.
• Grab&Go is not a separate location type: it is the Is a Grab&Go ? switch on a retail or wholesale location. When it is on, customers can reserve meals that are physically in stock at that location from the Grab&Go page of your website.

A retail or wholesale location can also be marked Is a Pickup Location? so it doubles as a meal-prep pickup point. The counts of active locations of each type are limited by your plan (see the questions on limits).