Shivaratri is a night of inward attention. Where most festivals are bright and noisy, this one is kept with fasting, quiet chanting and staying awake (jagaran). The idea is to stay alert and turn the mind towards Shiva, who is seen as pure awareness beyond birth and death.
The night is divided into four quarters (prahars), and many devotees worship Shiva once in each, with a different offering every time. The most sacred part is the midnight period (Nishita Kaal), when Shiva is believed to have appeared as an endless column of light. This page shows the Nishita Kaal Puja and Four Prahar Puja times for your city.
The festival is also remembered as the night of Shiva's marriage to Parvati, and in many places it is celebrated with wedding processions, music and fairs. It is observed by people of every background: householders, ascetics, young people hoping for a good partner, and those seeking peace of mind.
Once Brahma and Vishnu argued over which of them was greater. A huge column of fire appeared between them, with no visible beginning or end. Brahma flew upward as a swan to find its top, and Vishnu dug downward as a boar to find its base, but neither could reach the end. Shiva then appeared from the column, showing that he was beyond both. This appearance as the boundless pillar of light (Lingodbhava) is believed to have happened at midnight on this night, and the Shivalinga is its symbol.
A popular folk story tells of a hunter who was caught in the forest after dark and climbed a bel tree to escape wild animals. To stay awake he kept plucking leaves and dropping them below, unaware that a Shivalinga stood under the tree. Without food, awake all night and offering bel leaves without knowing it, he had kept the Shivaratri vow. By Shiva's grace his heart changed, and he gave up hunting. The story is told to show that sincerity matters more than elaborate ritual.