Use of 'The'
1. When we speak of s particular person or things already referred to.
e.g. I dislike the follow
2. When a singular noun represents a whole class.
e.g The mango is considered the king among fruits
3. With name of
i) gulfs, river, oceans and mountains
ii) Certain books
iii)Musical instrument
iv) The invention
e.g. I hate the telephone for its constant ringing
v) Parts of body
vi) Religious groups
vii) Names enforcing law
e.g. the police, the navy, the Air Force
viii) Political parties
e.g. the congress, the Janata party
ix) Aeroplanes, ship, trains etc.
e.g the Rajdhani express
x)Before the name of empire,dynasty or historical events
xi) Clubs foundation etc.
xii)With superlatives
e.g He is the best boy in the class
xiii) Before the comparative degree
e.g The more they get, the more they want
xiv) Before an adjective when the noun is understood
e.g. The poor would favour him.