Billable hours are the hours that freelancers can include on their invoices and thereby charge a client for. Billable hours may include the time spent working, planning, participating in meetings, and more.
Confidentiality is the act of keeping sensitive information private between two parties, unless there is written agreement that says otherwise. A confidentiality agreement or clause is also known as a nondisclosure agreement.
In freelancing, overtime refers to the time that a freelancer works beyond the amount that was quoted or specified on the retainer agreement. Paid overtime is not guaranteed and should be negotiated upfront.
Subcontractors are people or companies that are hired by a contractor to handle certain parts of a project. For example, as a freelance writer, you may subcontract a graphic designer to complete an assignment.