Voice acting is the art of providing voices for animated characters (including those in feature films, television programs, animated short films, and video games) and radio and audio dramas and comedy, as well as doing voice-overs in radio and television commercials, audio dramas, dubbed foreign language films, video games, puppet shows, and amusement rides.

Performers are called voice actors/actresses, voice artists or simply voice talent, and their roles may also involve singing, although a second voice actor is sometimes cast as the character's singing voice. Voice artists are also used to record the individual sample fragments played back by a computer in an automated announcement. At its simplest, this is just a short phrase which is played back as necessary, e.g. the Mind the gap announcement introduced by London Underground in 1969. In a more complicated system such as a speaking clock, the voice artist usually doesn't actually record 1440 different announcements, one for each minute of the day, or even 60 (one for each minute of the hour), instead the announcement is re-assembled from fragments such as "minutes past" "eighteen" and "pm." For example, the word "twelve" can be used for both "Twelve O'Clock" and "Six Twelve." For some automated applications, such as London Underground's Mind the gap announcement, the sound of a voice artist may be preferred over synthesized voices because the human voices sound more natural to the listener.

Aya Hirano (平野 綾, Hirano Aya^?, born October 8, 1987) from Nagoya, Aichi Prefecture, Japan, is a Japanese voice actress and J-pop singer who has had roles in several anime, visual novels, and TV commercials in Japan. She was contracted to Space Craft Produce, a branch of the Space Craft Group, for her voice acting career, and for her singing career, she was signed under Lantis. She left both Space Craft and Lantis in 2011. Hirano moved to the voice acting agency Grick in August 2011.

Hirano spent a few of her very early years of life in America before returning to Japan. In 1998, she joined the Tokyo Child Theatrical Group division of the Space Craft Group company. Eventually, she began to appear in commercials and got her first role as a voice actress in Tenshi no Shippo. From 2002 to 2003, she was a member of the short-lived girl band "SpringS."

After graduating from high school, she began seriously pursuing her voice acting and solo singing career. Her big break came in 2006, when she was cast as the voice of Haruhi Suzumiya, the title character of the anime series The Melancholy of Haruhi Suzumiya. The series' public success has greatly enhanced her popularity and career in Japan. Her CD single Bōken Desho Desho? containing the opening song of the show sold out in Japan the very day it was released. This success was followed by her voicing two lead characters in anime based on popular manga (Reira in Nana and Misa in Death Note). Her popularity was confirmed at the first Seiyū Awards, where she won "Best Newcomer (female)", for her role as Haruhi Suzumiya; the same role also won her a nomination as "Best Main Character (female)". At the same awards, she was also nominated for "Best Supporting Character (female)", and earned two nominations for "Best Single" (One of which is a solo, Bōken Desho Desho?; the other was a group nomination for the single Hare Hare Yukai). In 2008, she won the "Best Main Character (female)" award at the second Seiyū Awards.