Customer service and support (CSS) is a term with two meanings. Most generally, it refers to the functions of a contact center in handling post-sales customer inquiries that require some effort or action on the part of the business. More specifically, it refers to the elements of the software stack that facilitate those operations, primarily case tracking and trouble ticketing.
There are many software components that facilitate contact center operations. Historically, the industry has relied, in part, on niche or best-of-breed applications but this is shifting in favor of broadly integrated suites or ecosystems. When we look at CX trends beyond the contact center, the shift is even more pronounced, with the bundling/collection of applications from martech to CRM-incorporating software that were formerly/previously purchased separately.
Voice of the Customer (VoC) is a catch-all term that refers to the collection of customer feedback in various formats. Sometimes this feedback is in the form of quick surveys or reactions to questions like, "Did I resolve your issue today?" or "Would you recommend our service to a friend?" Alternatively, it can be derived from less specific but more numerous data signals that span multiple interactions or across a customer base. Most businesses make an effort to capture some customer feedback.