Shares are pieces of a limited company. If you own them, you’re technically called a “shareholder”.
You can get shares in many ways like:
Starting your own limited company
Receiving shares in the company that you work for – as a bonus or as an incentive
Buying them, usually through a broker or investment app
They are also sometimes called “stocks”.
What owning shares means for your tax situation:
If you earn dividends from your shares, and if those dividends are over £1,000 (the dividend allowance this year), you need to pay dividend tax on them (either through your tax code or through a Self Assessment tax return)