A Bitcoin address is a long string of 27–34 numbers and letters that acts similarly to an email address. The address enables the Bitcoin blockchain to recognize when bitcoins are sent and received. These addresses can be used by anyone, from single individuals to businesses to multiple people accessing the same address if desired. The address is unique to each wallet; for example, if you were sending Bitcoin to a friend, they would provide you with their unique wallet address which tells the system where to send the Bitcoin.
Additionally each address contains a checksum to ensure it is valid, as such it is nearly impossible to accidentally send bitcoin to a mistyped address.