a real-world example of how the mark is actually used on goods or in the offer of services.

Labels, tags, or containers for goods are considered to be acceptable specimens of use for a trademark. For a service mark, specimens may be advertising such as magazine advertisements or brochures. Actual specimens, rather than facsimiles, are preferred. However, if the actual specimens are bulky, or larger than 8½" x 11", then the applicant must submit facsimiles, (e.g., photographs or good photocopies) of the specimens. Facsimiles may not exceed 8½" x 11". One specimen is required for each class of goods or services specified in the trademark application.