Difference between Unit and Share?
A share or stock is part of an individual company. Unit (Trusts) are a collection of different (and usually related) shares.

For example, I am currently investing in a Singapore Equity Fund. And this is known as a Unit Trust. And within the Singapore Equity Fund, my investment is made up of different company shares, e.g. the local bank shares, telecommunication company and some other companies.

And these Unit Trusts are usually managed by a Fund Manager who belong to a Fund Management Company (or known as Fund House). And there are many different Fund Management Companies in Singapore with their own expertise and knowledge.

Source: here