Q). In SAP how does a user execute the MRP run for a material?

Answer:

The entire purpose of MRP is to plan for a material. The MRP can be executed using the transaction code MD02. MRP Material Requisition Planning can be done for a single material item or a multilevel plan can be run for a material within a plant. But, what exactly does MRP do. Material Requisition Planning creates PR purchase requisitions, PO purchase orders, or planned orders for the material. This is done on the basis of the settings selected in the transactions. To take an example, a particular material item may be procured externally, in such a case, an MRP run creates requirements for that material through the respective plant from a sales document.

Such questions are very popular in SAP interviews both functional as well as technical. I would suggest you go through the basic material you have on the module you are focusing on. Another important source of information is SAP help which gives explanations to each and every term.