box with multiple text insertions

hello

when registering a user, i want him/her to insert different type of work "keywords" automatically separated by typing a comma (eg. account, manager) or by pressing tab key

you can find this type of box in youtube when you enter the keyword you want your video to be searched about

i hope i made myself clear

thank you very much

That's a tags field. We currently do not have such a field available. Best I can suggest is to use a textarea field and having each value on a new line.