Explain HD and 4K for my AI video

Explains what resolution means for an AI video and whether HD or 4K fits your screen, upload and budget, in about 250 words.

Task: Explain what video resolution means and tell me whether HD or 4K is the better choice for my AI video. Context: I am [your experience with video, for example none]. The video will be shown on [phones, TVs, a website or a screen at an event] and uploaded to [platform]. I pay per generated second or credit, so cost matters, and my budget is [budget]. Rules: - Define resolution, pixels and aspect ratio in one sentence each, without jargon. - Explain what a higher resolution adds and what it does not fix, such as a poor prompt or a flickering clip. - Compare HD and 4K for my screens, my upload platform, file size and cost, and then give a clear recommendation. - Do not state the exact resolutions, limits or prices of any tool. Tell me to check them in the tool's own settings and pricing. - Where my situation leaves the answer open, say which question decides it. Result: About 250 words. Start with the recommendation in one sentence, then the three definitions, then a list of three trade-offs.

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