The Vocabulary browser is accessible from the Utilities main menu. This shows all vocabularies registered in openBIS and the terms they contain. Vocabularies are predifined lists of values to choose from in given fields. Vocabularies can be created/modfied by an openBIS Instance admin (see New Entity Type Registration).
This information is needed for filling the forms for Batch Upload or Batch Update of Objects. If an Object has a property of type Controlled Vocabulary, the codes of the vocabulary have to be entered in the form.