Stop Words are words which do not contain important significance to be used in Search Queries. Usually, these words are filtered out from search queries because they return a vast amount of unnecessary information.
This word can cause problems, for example, if they are used when naming a tag in LabArchives. If you name a tag “to do”, which contains 2 stop words, it will not be searchable.
They are also unlikely to return a search result if you use them in Basic or Advanced search in LabArchives.