“C/o” stands for “in care of.” When mailing a letter or parcel to someone at another person’s address, it is used. Mail can occasionally be sent to someone at a business address using this method.
When sending correspondence “in care of” someone, the name of the person or business at the address to whom the correspondence is to be delivered comes after “c/o” and is addressed to the intended recipient.
The sender simply writes or types a “c” followed by a forward slash and a “o” when addressing mail by hand or on a computer. The “c/o” sign can also be created on a computer by selecting “Insert” and then “Symbol” before entering the code 2105.