Investing for beginners UK — key terms and concepts explained

Investing comes with its own language, and the unfamiliar terminology can be one of the biggest barriers for beginners. This article works through the essential concepts and terms you are likely to encounter, providing a foundation before you start investing. For a step-by-step process to actually begin, see our guide to how to start investing in the UK.

Shares (equities)

A share represents a small ownership stake in a company. When you buy shares, you become a part-owner of that business, entitled to a proportional share of its profits (often paid as dividends) and, in theory, a say in major company decisions through voting rights. Share prices fluctuate based on the company's performance, market sentiment, and broader economic factors.

Funds

A fund pools money from many investors to invest in a collection of assets — shares, bonds, or other investments — rather than a single company. This provides instant diversification, reducing the impact of any single investment performing poorly. Funds can be actively managed, where a fund manager makes investment decisions aiming to outperform the market, or passively managed (index funds), which simply track a market index. See our guide to index funds for more on passive investing.

Bonds

A bond is essentially a loan you make to a government or company, which pays you interest over a fixed period and returns your original investment at the end of the term. Bonds are generally considered lower risk than shares, though they are not risk-free — bond prices can fall, and there is a risk the issuer could default on payments, particularly with corporate bonds from less financially stable companies.

Diversification

Diversification means spreading your investments across different assets, sectors and geographic regions, reducing the impact of any single investment performing badly. A common saying in investing is "don't put all your eggs in one basket" — diversification is the practical application of this principle, and it is one of the most reliable ways to manage investment risk without necessarily sacrificing potential returns.

Risk and volatility

Risk in investing generally refers to the possibility of losing money, while volatility refers to how much an investment's value fluctuates over time. Higher volatility does not always mean higher risk of permanent loss — a volatile investment held for the long term may still produce a positive outcome despite short-term price swings, whereas a less volatile investment held briefly during a market downturn could still result in a loss if sold at the wrong time.

Compound growth

Compound growth refers to the effect of investment returns generating further returns over time — your gains are reinvested and themselves start generating gains. This effect becomes increasingly powerful the longer money remains invested, which is why starting to invest earlier, even with smaller amounts, can have a significant impact on long-term outcomes compared to starting later with larger amounts.

Asset allocation

Asset allocation refers to how your investments are divided between different asset classes — shares, bonds, cash and others. Your appropriate asset allocation depends on factors including your investment timeframe, attitude to risk, and financial goals. Generally, a longer investment timeframe allows for a higher allocation to shares, which carry more short-term volatility but have historically offered higher long-term returns than bonds or cash.

Ongoing Charges Figure (OCF)

The Ongoing Charges Figure represents the annual cost of holding a fund, expressed as a percentage of your investment. Even seemingly small differences in OCF compound significantly over long investment periods, making cost a genuinely important factor when choosing investments — not just an afterthought.

Dividend

A dividend is a portion of a company's profits paid out to shareholders, typically on a quarterly or annual basis. Not all companies pay dividends — some reinvest profits into growing the business instead. Dividend income from shares held outside an ISA or pension is subject to a separate Dividend Allowance and dividend tax rates.

Bull market and bear market

A bull market refers to a period of rising asset prices and general investor optimism, while a bear market refers to a sustained period of falling prices, typically defined as a decline of 20% or more from recent highs. Both are a normal part of market cycles, and long-term investors generally aim to stay invested through both phases rather than trying to predict and time market movements.