What is the use of Tables in MM. i.e. How the tables get created?

Through SE11 you can create a new Table. In MM if you create a Material Master MARA, MARM, MARC,MARD, MBEW & MVKE will updated. In Vendor Master LFA1, LFB1 & LFM1 will be updated. The same applies to EKKO,EKPO for P.O, MSEG & MKPF for MIGO & RBKP for MIRO.