TD Ameritrade: FDIC Insured deposit account core not covered by SIPC

I would like some education on Roth IRA. When I deposit money to my roth IRA, it was listed as cash, then second day it is listed as "FDIC Insured deposit account core not covered by SIPC".

What does "FDIC Insured deposit account core not covered by SIPC" mean?

Thanks.