CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

What is Portfolio?

A portfolio is a selection of financial assets held by an investor. These can include stocks, bonds, commodities, options contracts as well as investments in mutual and exchange-traded funds. It is thought prudent to have a diverse investment portfolio as this limits an investor’s exposure to the risk of being tied to a single financial instrument.