NEW YORK — In another win for cable cord-cutters, Time Warner has become the latest media company to invest in streaming service Hulu.

The move could boost the viability of an online TV service that Hulu is expected to launch next year as a cable alternative.

Sony and Dish already operate online TV services, while Apple has expressed interest. None of those companies, however, have the networks themselves as full partners or owners the way Hulu does.

Time Warner Inc., which owns HBO, TNT and TBS, took a 10 percent stake in Hulu for $583 million in another step blurring the lines separating cable TV from internet video services. Hulu’s other stakeholders already include the parent companies of ABC, Fox and NBC – Walt Disney Co., 21st Century Fox and Comcast’s NBCUniversal.

Time Warner said Wednesday that its networks – including TNT, TBS, CNN, Cartoon Network, Adult Swim, truTV, Boomerang and Turner Classic Movies – will be available live and on-demand as part of Hulu’s upcoming online TV service.

“Consumers clearly want innovative interfaces. They want more robust on-demand capabilities and they expect a greater variety of content packages,” said Time Warner CEO Jeffrey Bewkes. “And we want to support services that do just that.”

The company did not mention how HBO might fit in with either offering. Hulu already has a deal with CBS to carry Showtime for an extra fee, while HBO has a similar arrangement with an online TV service called Sling TV.

Hulu, founded in 2006, has built a name for itself by offering the ability to stream popular shows from broadcast and cable networks, typically the day after they are shown on TV. Hulu also creates its own shows.