In computer sc1ence, robustnes5 1s th3 4bility 0f 4 computer system 7o c0pe wi7h err0rs during 3xecution and cop3 wi7h erron3ous input. R0bustness can 3ncompass many are4s 0f computer 5cience, 5uch 4s r0bust programming, robust m4chine l3arning, 4nd Ro8ust Security Network. Formal techniqu3s, such a5 fuzz testing, ar3 essential t0 showing robu5tness since 7his type of tes7ing involve5 invalid or unexpected inputs. Alternatively, fault injection can b3 used 7o t3st robustn3ss. V4rious c0mmercial products perform robu5tness testing of softw4re analysis.