What is a Sector?
Sector consists of group of companies that does similar business within the market. So if a sector is up, it means to say that all the companies in the business tend to gain and vice versa.
For example, all pharma companies come under pharmaceutical sector, All IT companies come under Technology sector, All companies who are into manufacturing soaps, biscuits etc. come under FMCG sector.
There is no particular sector which is always on top or bottom. This can be very volatile and depends on the many factors such as domestic, international market, inflation, seasons, rupee value etc.
In the recent down turn, few sectors which survived are FMCG, Pharma and Banking.