What do you mean by secondary data? Explain the various sources of collecting secondary data?

Secondary data is the information gathered for purposes other than the completion of a research project. A variety of secondary information sources is available to the researcher gathering data on an industry; potential product applications and the i market place. Secondary data is also used to gain initial insight into the research problem.
Following are the sources of collecting secondary data:
Sources of Collecting Secondary Data:
Published sources.
(i) Govt Publications : Different departments
of central government and state government collect and publish data at different times, Government publication are as follows :
(a) Reserve Bank of India Bulletin : Monthly.
(b) Statistical Abstract of India : Annual
© Census Reports.
(d) Indian Trade Journal: Weekly.
(ii) International Publications: There are number
of international organizations which publish data at different times such as—
(a) International Labour Organisation (ILO)
(b) World Health Organisation (WHO)
© United Nations Organisation (UNO)
(d) World Bank.
(e) International Monetary Fund (IMF)
(iii) Magazines and Trade Journals : A number of magazines collect and publish the data periodically. Trade and Professional bodies, trade associations like FICCI, CII, etc, publish the related data in their Trade Journals. Various financial and economic journals are also published by autonomous and private institutes.
Examples of this source are:
(a) Reserve Bank of India Bulletin
(b) Foreign Trade Review
© Economic Journals, Economic Trends -
(d) ‘The Chartered Accountant’
(e) ‘Indian Finance’
(iv) Publications of Research Institutes: Different research institutes publish results of research works at different times such as :
(a) University Research Bureaus.
(b) Central Statistical Bureaus.
© Statistical Research Bureaus.
(d) Institute of Economic Growth