From
In short
A preposition used to indicate the starting point, origin, or source of something.
In plain words
It shows where something begins or where it comes from. You use it to talk about your home, a starting time, or the person who gave you an object.
A simple example
If you say, 'I am travelling from London', it means London is your starting location. You might also say, 'This gift is from my sister'.
Why it matters
It helps people understand the direction of movement and the history of objects. Without it, sentences about origins and beginnings would be unclear.
Easy to mix up
It is often confused with 'to', which indicates the destination rather than the starting point.