It is a set of plug-ins for text editors that allow high speed coding and editing in html and xml.it gives abbreviations of the tags that is like we write p and then pressing enter keyword it will show the element (<p>content</p>).it saves time. it prevent the developers to make mistake because it automatically correct the wrong syntex which was written by the developer.this software is used by vs code and other text editors as this software is already installed in vs code we don't need to install it but for other text editors we will have to download it.different types of tags are there as div tag which contain nested tags like if we code like div>h1>p h1 then h1 and p tags will be nested inside div tag and p tag would be nested in h1 tag.