Quick ESTA questions

If travelling to attend a conference (not presenting) do you need to put anything down other than leisure traveller, is it business?

Since haven't returned to US after first enrolling, do you just go back into your form and update stay details each time?

Obvious probably, but advice welcomed
NH

[Neil]

You don't have to update your ESTA, as it isn't mandatory, although it probably wouldn't harm if you did. Might even be worth applying for a new one, to cover you for another 2 years anyway.

... Might even be worth applying for a new one, to cover you for another 2 years anyway.

or it last until the day your passport expires if thats less than 2 years away

but yes updating is always good