What are tags used for?
When performing a search, entering tags – or keywords – lets you view all items which also contain the same tag. 

For example, if you are a CareToTrade user, where you post an item to advertise and look for items to exchange—such as the items you list, using search tags can set your items apart from others with more general content. So if you post a house, you could use tags like "house", "building" and "real estate" to increase your visibility in search results.

Members must use tags that are relevant to the content they post or the products they sell. Inappropriate words or terms that amount to keyword spam are not permitted and are subject to removal.

How to search by tags?
In the search box, enter tag's content and click the search button.  The system will collect matched items and display them in search result. You can also click on tag name of a product when you view the product detail, you will see all products included in the tag.

How to post item with tags?
Tags show up on My product pages which are displayed when you click Post ads on the navigation bar or create product in your store. You can create your tags as you set up each feature. Number of tags and tag length are not limitted, tags are separated by space character.