BPC 10.1 back end - Is it BI or BW?

Dear All,

In BPC 10.1's context, when we say the data is stored in the backend, is it BI or BW? I am confused with these terminologies. My understanding is... when we say BPC back end, it is BW 7.4. But, is it BW 7.4 or BI 7.4? Where can I check this version details?

Thank you.

Regards,

Peri