LocalCast for Chromecast, Smart TV, Roku, etc. is an Android app that allows you to stream local media files (videos, music, photos) from your Android device to various other devices, including :

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Chromecast:

Google[SQ]s streaming dongle.
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Smart TVs:

Many different brands and models of smart TVs.
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Roku:

Roku streaming players and TVs.
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Amazon Fire TV:

Amazon[SQ]s streaming device.
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Apple TV:

Apple[SQ]s streaming device (with some limitations).
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DLNA receivers:

Devices that support the DLNA media streaming protocol.

Essentially, it acts as a bridge between the media stored on your phone or tablet and your larger screen devices. It supports a wide range of file formats and allows for things like subtitle selection (where applicable) and playlist creation.

In short, if you have videos, photos, or music on your Android device that you want to view on a bigger screen without relying on cloud services or specific streaming apps, LocalCast is a tool that can help you do that.