Quizizz is a game show-style quiz tool similar to Kahoot!, Quizalize, and Quizlet. It has both a web-based version and iOS, Android, and Chrome apps for students. Teachers create an account, but for students it's optional. Students access a quiz on their device or computer using an access code, and they can see both questions and answers on their screen. There's a searchable database of hundreds of quizzes, and teachers can use those or edit them to meet their needs (including just picking and choosing select questions).
Students can take the quizzes all together competitively as a class (and see classmates' progress), or teachers can assign the quiz as homework and have students complete it on their own time. The quiz advances on its own as students answer.
The resulting data is compiled into a spreadsheet to give the instructor a clear visual of the students’ performance in order to analyze trends in which areas might need the most focus in the future. This immediate feedback can be used by teachers to revise future learning activities and altar the focus of material by putting a larger emphasis on concepts that students are struggling with.