How herbs,shrubs and tree are different from each other?

Herbs (i.e. herbaceous plants, distinct from plants used as culinary herbs) are non-woody plants, often dying down in winter. Trees and shrubs both have permanent woody stems. Shrubs are multistemmed and usually smaller than trees which usually have a single stem. There is no absolute distinction between a tree and a shrub and some types of plant can be either a tree or a shrub depending on how they grow..