I was thinking that Jail and Prison are same. But today I came a cross this an information 'Jail vs Prison'.
The link that I have given here has many useful 'vs'
Jail: A place of detention; a place where a person convicted or suspected of a crime is detained.
Prison: A place of long-term confinement for those convicted of serious crimes.
The most notable difference is that prison inmates have been tried and convicted of crimes, while those in jail may be awaiting trial. A prison is under the jurisdiction of either federal or state, while the jail holds people accused under federal, state, county and/or city laws. A jail holds inmates from two days to a year.