How EMI is computed
The equated monthly installment uses the standard amortization formula: each payment covers that month's interest on the remaining balance plus some principal, so early payments are interest-heavy and later ones principal-heavy.
What moves the number most
Term length changes total interest dramatically: the same loan over 10 years instead of 5 roughly doubles the interest paid even though the monthly payment falls. Compare the "total interest" line, not just the EMI.