Append n Rows into a Single Row

Hi,
I am totally new to PostgreSQL and this is my first script.
Can anyone please help me with my following requirement

I have script that returns 1 column and 40 rows.
My requirement is update this existing script to show all the 40 rows data
in a single row as a string.

For example
The current script returns, something like this
Tom
Tad
Max
Ted

I have to update the existing script to show the above results as follow
Tom || Tad || Max || Ted

Something like colace in Ms sql

Any help is really appriciated.

Thankyou in Advance.

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