Question

what is shikhara ?In temples​

Answer 1

Shikhara, in North Indian temple architecture, the superstructure, tower, or spire above the sanctuary and also above the pillared mandapas (porches or halls); it is the most dominant and characteristic feature of the Hindu temple in the north.

Answer 2

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Shikhara is a Sanskrit word translating literally to "mountain peak", refers to the rising tower in the Hindu temple architecture of North India, and also often used in Jain temples. A shikhara over the garbhagriha chamber where the presiding deity is enshrined is the most prominent and visible part of a Hindu temple of North India.
In South India, the equivalent term is vimana; unlike the shikhara, this refers to the whole building, including the sanctum beneath. In the south, shikhara is a term for the top stage of the vimana only, which is usually a dome capped with a finial; this article is concerned with the northern form. The southern vimana is not to be confused with the elaborate gateway-towers of south Indian temples, called "gopurams", which are often taller and more prominent features in large temples.