ELI5: Explain Like I'm 5

Ammonium perchlorate composite propellant

Ammonium Perchlorate Composite Propellant (APCP) is a type of fuel used in rockets and other spacecraft. It is made of a mix of chemicals, including ammonium perchlorate (a type of salt), which helps to create a powerful reaction when ignited. This reaction releases a large amount of energy and produces hot gases, which create thrust and move the rocket forward. APCP is a safer and more efficient type of fuel than other fuels used in rockets in the past.