An ETF = Exchange Traded Fund.
The UK Flagship index is the FTSE-100.
This is the UK’s leading companies. To get access to all the FTSE-100 companies, one can buy shares in all the FTSE-100 companies, or buy an Unit Trust Tracker of the FTSE-100 like the Legal and General FTSE-100 tracker:
or by and Exchange Traded Fund like the HSBC ETFS 100.
What is interesting is that the price of the FTSE-100 ETF is the same as the FTSE-100 index.