A sock puppet is an additional username used by a user who edits under more than one name. The user who uses a sock puppet may be called a sock puppeteer. Use of sock puppets is discouraged in most cases. The reason for discouraging sock puppets is to prevent abuses such as a person using multiple accounts to circumvent policies and guidelines or cause disruption. Users who make use of sock puppets for such purposes may be banned from editing.
Multiple accounts may have legitimate uses, but you must refrain from using them in any way prohibited to sock puppets, and from using one account to support the position of another, the standard definition of sock puppetry. If someone uses multiple accounts, it is recommended that he or she provide links between the accounts, so it is easy to determine that they are shared by one individual.
A current list of suspected sock puppets, or sock puppeteers.