What is BAsic Demat Account Facility(BSDA)?

I need to know

that BSDA option is avail the following Facility,It have 2 options

yes

no

what Yes Means?

What No Means?

Is it Charge?

Check this - http://www.sebi.gov.in/sebiweb/home/detail/24288/new/PR-Facility-for-a-Basic-Services-Demat-Account-BSDA-