Personal (/pɜːsənəl/) is an adjective. You use it to say that something belongs or relates to a particular person.
Personnel (/pɜːsənel/) is a noun. The personnel of a company or organization are the people who work for it.
Personnel is a plural noun. You do not talk about 'personnels' or 'a personnel'.
| Noun | 1. | personnel - group of people willing to obey orders; "a public force is necessary to give security to the rights of citizens"organization, organisation - a group of people who work together guerilla force, guerrilla force - an irregular armed force that fights by sabotage and harassment; often rural and organized in large groups armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker" paramilitary, paramilitary force, paramilitary organisation, paramilitary organization, paramilitary unit - a group of civilians organized in a military fashion (especially to operate in place of or to assist regular army troops) constabulary, police, police force, law - the force of policemen and officers; "the law came looking for him" private security force, security force - a privately employed group hired to protect the security of a business or industry military police, MP - a military corps that enforces discipline and guards prisoners patrol - a group that goes through a region at regular intervals for the purpose of security rank and file, rank - the ordinary members of an organization (such as the enlisted soldiers of an army); "the strike was supported by the union rank and file"; "he rose from the ranks to become a colonel" staff - personnel who assist their superior in carrying out an assigned task; "the hospital has an excellent nursing staff"; "the general relied on his staff to make routine decisions" line personnel - personnel having direct job performance responsibilities management personnel - personnel having overall planning and direction responsibilities |
| 2. | personnel - the department responsible for hiring and training and placing employees and for setting policies for personnel managementdepartment, section - a specialized division of a large organization; "you'll find it in the hardware department"; "she got a job in the historical section of the Treasury" |