Where can I get a credit card if I have bad credit?

Can I still get a credit card secured or unsecured if i have bad credit? How can I improve my credit?

Whats the difference btwn a unsecured and a secured credit card?

I am trying to re-establish my bad credit and I was told I should get an unsecured card to start off. Is it easier to be approved for an unsecured card rather than a secured card?