Debt consolidation is the process of combining (consolidating) all of your debts into the one debt. The benefits of debt consolidation are to potentially save you money and to make it easier for you to manage your debt with a single repayment.
Refinancing is the process of replacing your current debt, such as a personal loan or home loan, with a more favourable debt often at another financial institution. The benefits of refinancing varies, however usually a more favourable debt includes lower interest rates or ongoing fees, potentially saving you money over time.