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The term numerical relativity (NR) is used for mathematically modeling general-relativity-sensitive scenarios using numerical methods, inevitably requiring computers to carry out, i.e., a branch of computational astrophysics. Numerical methods can solve problems involving equations for which no one has found analytical solutions (e.g., if such solutions don't exist), and such equations are common in general relativity problems. Example scenarios include close interactions, such as mergers between compact objects, i.e., involving strong-field gravity. The numerical calculations of black hole merger scenarios were critical in recognizing the likely characteristics of the mergers producing the recently-recorded gravitational-wave events.