List two ways the first ionization and second ionization of an atom are similar

The first ionization and second ionization of an atom are similar in such a way that both ionizations have atom and energy and second way is that both lose an electron.
The process in which atom or molecule acquires a positive or negative charge by losing or gaining electrons to make an ion is known as the ionization process.
The difference between first and second ionization of an atom is that both started and ended with different ions.