Contractual obligations
The future payments a company is already locked into by contract: leases, purchase commitments, construction contracts, debt repayments and interest. Most of them are not on the balance sheet yet, so companies list them in a separate table in the 10-K, by the year they come due.
Simple example
A bakery signs a 5-year shop lease at $20 a year, agrees to pay $30 for new ovens within the next year and owes $25 on a loan due this year. Its contractual obligations total $155: $75 due in year 1 and $80 of rent in years 2 to 5, even though it hasn't paid any of it yet.