Algorithm competitions are events where participants solve complex problems using programming and mathematical skills. These contests often involve creating efficient algorithms to tackle challenges within a limited time frame. Competitors can work individually or in teams, and they are typically judged based on the accuracy and efficiency of their solutions. Popular platforms for these competitions include Codeforces, LeetCode, and HackerRank. Participants range from students to professionals, and many competitions offer prizes or recognition. These events help improve problem-solving abilities and foster a sense of community among programmers and computer scientists.