Shareware is software that is distributed free on the basis that if you like it you'll pay for it later.

It's great because it allows you to 'try before you buy'. You can use the software and if you don't like it you haven't lost a penny.

So, let's say you want a program to manage your passwords, you can download two or three, then try them and choose the one you like best.

Trial versions

Most shareware programs have a built-in expiry date. It's normally around 30 days and after that the user can no longer get into the program.

It will normally be locked until you open the software again with a key. To get the key you'll have to pay for the program.

Another type of shareware is sometimes called liteware. You download the entire program but certain capabilities are disabled.

The idea is to tempt you buy the full program to get its full functions. These only become available when you download the 'full' program.

Freeware

Programs offered at no cost are called freeware. You don't have to pay anything although they may ask you to send money if you like it. You don't have to though.

Common forms of freeware are 'beta' programs. These are 'works in progress' and companies release them so you can help them to test them.

The program maker will ask you to let them know if you have any problems with it so they can fix them before releasing the final version.

Where to find it

Here are some popular sites for finding shareware:
edownloads
Cnet
ZDnet