If the company makes a profit, you may essentially get a cut.
Some shares allow you to take this cut by paying you a yearly dividend.
Others have a rule that your cut will be re-invested in the company and you only make money when you sell your shares at a time when the share price has risen.
On the flipside, if the share price decreases from what you paid for it, the value of your ownership has decreased.
Hopefully you can still hold the shares until the share price starts to increase in value again, but if you need to sell at a time when the share price is less than what you paid for it, you will make a loss.
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While you can purchase shares easily online, before logging on, consider this: unless you are prepared to fully research the company you're investing in, which includes looking at the people managing it and sitting on its board, the particular market they operate in and what potential they have, you may need to get help from a professional.
Not only do you need fairly expert analytical knowledge, you also must have the time to monitor your shares - sometimes daily - to determine the right time to sell. Frankly, this can turn into a full-time job.
Managed funds
When you invest in a managed fund, you pool your money with other investors, and this allows the fund purchasing power to buy shares in bulk and sometimes at a lower price.
You can start with as little as a $50 regular payment or a $1,000 lump sum.
Once you buy into a fund it may be low maintenance - almost set and forget.
It is also easier to complete your tax return as there is less paperwork.
The fees can be higher than other forms of investing - but remember that fees are part and parcel of a service that could make you money over time as well as potentially providing you with a much more diversified investment than other investments.
You can start with as little as a $50 regular payment or a $1,000 lump sum.
Also remember that some managed funds may take a little longer to convert to cash, unlike direct shares which are highly liquid.
With hundreds of funds on the market - and many different types available - you may wonder how you choose a managed fund.
The best way is to seek advice from a financial adviser who will make expert recommendations to you that are tailored specifically to you and your situation.
Investment properties
Buying an investment property is hugely popular in New Zealand, but what's important to remember is that this is usually a long-term investment.
You can do really well with property if you pick the right property and the market performs well in your timeframe - but property is not as low risk as many people think
You can do really well with property if you pick the right property and the market performs well in your timeframe - but property is not as low risk as many people think.
Things to consider include that maintenance costs can eat into your profit and there could be times when your property is untenanted and you would need to bridge the gap on mortgage repayments.
Property is also not particularly liquid, meaning it could take time to sell and you can't get your investment converted back to cash quickly.
Bonds
With bonds you are simply lending your money to a government or company at an agreed interest rate for a certain amount of time.
In return, the borrower promises to pay you interest at regular intervals and repay your loan at the end of the term.
Not all bonds are the same though - some are reasonably safe while others can be more risky.
Other options
There are also other, less popularised investment options such as futures and options - which are extremely complex - and currency trading, which is the most liquid market in the world but also carries the risk of being unregulated.
If you're an investing virgin, these investments may not be the ideal starting place.
Remember, all investments carry risk and you'll need to make some sort of trade-off between the risk you're willing to take and the returns you're after.
To work out which investment option suits you it's important to know your goals, your timeframe and how much risk you can cope with.
It's a good idea to seek financial advice too so your investments can be professionally tailored to suit your circumstances.
Also keep reading about money, as education is an important part of empowering yourself financially.
Sarah Delany is an Authorised Financial Adviser with Spicers Portfolio Management based in Taupo.
This article is of a general nature and is no substitute for personal financial advice. To the extent that any of the above content constitutes financial advice, it is class advice only. A disclosure statement is available on request and free of charge.