If you mean ATM run by the Banks, it is the short form of Automatic Teller Machine.
brief introduction about myself
supply and demand
The link to the left will give you the basics.
In the introduction we will have to give a brief idea about your brand. it includes the brand name, objectives, caption etc. From the introduction it will be clear that what this brand for.
by giving a brief summary of what is happening in the essay
When making a speech of introduction, it is important to be concise and engaging. Providing relevant information about the person being introduced and setting a positive tone for the upcoming interaction are key criteria to focus on.
Optoelectronic deals in the study of light sensitive electronic devices.
They are probably referring to your business introduction, which is a brief overview/statements of who you are and what you have to offer to the interviewer. you should think of changing it slightly depending on who has asked the question, as each person needs to hear about different areas of your background/experience.
Give 5 examples of an ecosystem
encyclopedia
by just saying what is in your piece give a brief description about what your piece is actually about
Joseph J. Ayd has written: 'A brief introduction to the divine office'