Corruption is a habit in India since British rule i.e. from time even before independence.
That means the corruption habit has spread into India from British rule and though the British have left India, corruption stayed behind.
Presently corruption is widespread and extended into every walk of life.
There are many anti-corruption bodies to restrict corruption yet the issue seems to be raising severely.
The reason is corruption is not done for daily needs or luxury alone but also an essential thing to survive or keep up jobs and positions.
The small officers need to bribe higher officers to get promotion. For this these small officers decide to take bribes from the common public. Though not all officers have this type of need. But those officials in medium level or higher have this need.
For example a police officer needs to bribe higher officials to get control over entire police academy. In a recent news there was an issue where a high rank railway official tried to bribe son in law of the railway minister for an import position in railways.
A vice chancellor needs to bribe the official who appoint him. So he takes bribes from those people interested in recruitment within the university. It is a open secret that a simple clerk post demands a bribe of rs. 3 to 5 lakhs and position at assistant professor level demand 15 lakhs.
So the desire to save their careers and get promotions is also the cause of corruption.
In other departments like electricity, health care, water supply. The lower level employees take bribes directly from common man. They do it from hundreds of common men. This is because the money attained from bribes is shared in percentage among all the officials in the department with higher official having higher share. So there are instances where lower level employees even visit the residence places of common men to collect bribes. Because they face an enormous pressure from higher official to collect the bribes.
In case there is a raid by anti-corruption squad then the lower officials are caught red handed and then prosecuted while the actual higher rank people are left safe and not prosecuted.