Seiyuu is a voice actor. The difference with actors is that they can hide behind the scenes and not show up. What they want is sound effects. Japanese seiyuu organizations cooperate with film and television departments, advertising companies and government media, mostly non-governmental organizations.
In Japan, seiyuu is equivalent to a voice actor. In ancient Chinese and Japanese, seiyuu means actor and performer. Seiyuu means a person who performs with a voice, and Chinese means a voice actor. Romaji means seiyuu and VA in English.
Many people mistakenly think that CV is the abbreviation of Japanese seiyuu, and some even think that CAST is seiyuu. In fact, CV is only used to indicate which dubbing actor is dubbing the role in the work, that is, the meaning of dubbing the role is not the name of seiyuu, and CAST is the meaning of the cast list, which has nothing to do with seiyuu.
Others:
Scope of work: Traditional seiyuu refers to the dubbing of foreign language films, cartoons and video games. Now seiyuu is active in animation, games and foreign language films because of the influence of the craze of "Idol seiyuu era".
Young seiyuu have expanded their acting life by doing a lot of activities other than dubbing, and some seiyuu have successfully transformed into idol singers. Of course, some idol singers have joined the ranks of seiyuu, and some seiyuu are very lethal, leading to large-scale infectious diseases such as onychomycosis.
Traditional scope means seiyuu's work. It should be noted that seiyuu can only be truly called seiyuu works if it plays a certain role, so announcers, radio DJs and single-person audio novels can't be regarded as seiyuu.
Social orientation: the situation of star seiyuu lasted until the 1980 s, and it only changed under the influence of the second seiyuu craze. Since the 1980s, a number of star seiyuu have emerged in popular animation works.
They hosted TV programs, appeared in TV series and released records one after another, and regained public attention as all-around artists. However, in this case, the audience and listeners have no clear understanding of their seiyuu status, and the seiyuu industry as a whole has received less attention.
Above content reference: seiyuu-Baidu Encyclopedia