Jails are temporary holding facilities, usually run by the local police force, where people stay for short terms if they only need to be locked up for a short period, or before they go to trial. Prison is long term, usually run by the government or a private company, and it is where you go once you have been sentenced for your crime.

This depends on whether you are British or American. In the US, a jail is a local place where people accused of crimes are held temporarily, often while they are awaiting a trial. A prison is usually a larger facility where convicted criminals serve their sentences.

Google finds plenty of hits for "difference prison jail", doesn't it? For instance: http://cleminfostrategies.com/whats-the-difference-between-prison-and-jail/ https://www.prisonfellowship.org/resources/training-resources/in-prison/faq-jail-prison/ https://www.hg.org/legal-articles/what-is-the-difference-between-jail-and-prison-31513

There is no difference any article on the internet is misleading. Both words in any dictionary American Or British or Other English is defined as exactly the same. A place where people are held either while waiting for trial or sentencing or for set period of time after sentencing as their punishment. The confusion seems to be caused because some dictionaries say (such as by a Government) for the synonym and other dictionaries say the same thing for the opposite synonym. If you look up Jail in one dictionary it may give Prison as another example, giving the above example. But other Dictionaries will use Jail as an example synonym for prison using the same example (such as by a government). If you need to know any legal differences between say American system of Justice and the British system. you are asking on the wrong forum. this is not the place.