What is the difference Between WMS and SAP?

WMS is "warehouse management system" & this is includes staff, information, equpemint .etc . as any system it has input, outputs & processing procesures

While SAP is refer to brand name of an business application or enterprise software developed by  IBM 

A warehouse management system (WMS) is a software application that supports the day-to-day operations in a warehouse.

WMS is system which controls the movement and storage of materials within a warehouse 

It includes shipping, receiving, putaway and picking

WMS keeps track of the progress of products through the warehouse. 

SAP is a multinational software corporation that makes enterprise software to manage business operations and customer relations

SAP is especially well-known for its Enterprise Resource Planning (ERP) and data management programs.

This SAP software (SAP R/3) coordinate all the resources, information, and activities needed to complete business processes including WMS