Between the UK and US alone, there are several word spellings that are different such as between programme and program, practice and practise, honor and honour, and many more. The reason why this is can be caused by many things, mainly due to the contextual usage and spelling of the words and also due to the way printing was done back in the day. If you would like to learn more about ... https://www.uniccm.com/blog/program-vs-programme-key-differences-and-usage-in-american-and-british-english