Visa
In short
An official document or electronic record that allows a person to enter, leave, or stay in a specific country for a set period.
In plain words
It is a permission slip from a government. Even if you have a passport, you might need this special stamp or digital note to visit certain countries.
A simple example
A tourist from the UK wants to visit Japan for three months. They must apply for a specific entry permit before they fly to ensure they are allowed to stay.
Why it matters
Without the correct paperwork, travellers can be stopped at the border and sent home. It helps governments track who is entering their territory and for what reason.
Easy to mix up
People often confuse a visa with a passport, but a passport proves who you are while a visa proves you have permission to enter.