What are the differences between fixed and variable APR, and how do they impact the overall cost of borrowing?

The main difference between fixed and variable APR is that fixed APR stays the same throughout the loan term, while variable APR can change based on market conditions. Fixed APR provides more predictability in monthly payments, while variable APR can lead to fluctuating payments. The impact on the overall cost of borrowing is that fixed APR offers stability and easier budgeting, while variable APR can result in lower initial rates but potentially higher costs over time if rates increase.