Wikipedia:Blocking policy

Blocking is the method by which administrators technically prevent users from editing Wikipedia. Blocks may be applied to user accounts (including temporary accounts), IP addresses, and IP address ranges, for either a definite or an indefinite time, to all or a subset of pages. Blocked users can continue to access Wikipedia, but cannot edit any page they are blocked from (including, if appropriate, their own user pages). In most cases, a site-wide blocked user will only be able to edit their own user talk page.

Blocks are used to prevent damage or disruption to Wikipedia, not to punish users (see § Purpose and goals). Any user may report disruption and ask administrators to consider blocking a disruptive account or IP address (see § Requesting blocks).