Is Investing in Real estate investment trusts a Good idea?

Is Investing in Real estate investment trusts a Good idea?
Though I do a fair amount of reading of the real estate market, I must admit that I don't keep in touch with domains such as real estate investment trusts. I understand the REITs (as they are called) could be a very useful addition to one's portfolio, especially for those folks who wish to invest in real estate but are not actually keen on owning a house or real estate! What are the views of the members?
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