English uses the words a and the which are not found in other languages such as Gujurati.
a and the are known as articles.
a is an indefinite article, not specific, one of that type.
The is a definitive or specific object.
A fox
The fox
Jack and Jill went up the hill (Important to the story)
How to marry a millionaire (any one)
How to marry the millionaire (only one)
The queen (The important one.)
A queen (One of many.)
A President (Any one of that status.)
The president (VIP. Ours. Our club's. Our meeting's.)
Please lend me a pen. (Any one of that type.)
Where is the pen? (The important one. )