a talk

These are words for an occasion when someone speaks to an audience on a particular subject.

A talk gives information about a particular subject.

She will give a talk on keeping kids safe on the internet.

A lecture is a more formal talk given by an expert to a group of people about a subject. Most often, a lecture is when a university teacher talks to a group of students about a subject.

The lecture is entitled 'War and the Modern American Presidency'.

All first year students attend a lecture that introduces them to fields of scientific study.

A presentation is a speech in which someone talks about an idea, new product etc., often in a business or education context.

We were given a presentation of progress made to date.

A speech is a formal talk given to a large number of people on a special occasion.

You might have to make a speech when you accept the award.

An address is a formal speech, for example, at a conference or an important political occasion.

He took the oath of office then delivered his inaugural address.

An oration is a formal public speech about a serious subject, for example about someone who has died. This is a formal word.

It was to become one of the most famous orations in American history.

A speech in which someone talks about a serious subject in a detail can be called a discourse in formal language. This word can also be used to refer to a piece of writing.

She delivered a 30-minute discourse on the dangers of smoking.

The publication was the first major philosophical discourse on the subject of animal rights.

You can use the word eulogy to refer to a speech given at a funeral in which someone talks about and praises the person who has died. A eulogy can also be a piece of writing.

He delivered the eulogy at the funeral of a close friend.

It is not often that newspapers publish eulogies of criminals.

Speaking or public speaking is the activity of giving talks or speeches. These terms are uncountable.

He has several speaking engagements on his schedule.

She had to overcome her fear of speaking in public.

Reagan was gifted in public speaking.