Google NotebookLM

The specific problem NotebookLM solves is one that advertising professionals hit constantly: you have a collection of source material — client briefs, research reports, previous campaigns, market data, transcripts — and you need to synthesise it quickly into something useful. NotebookLM lets you drop all of that in and then question it, summarise it, and extract from it in natural language. The audio overview feature is the one that surprised me most in practice: it generates a listenable briefing from your source documents, which is genuinely useful before a client meeting when you do not have time to re-read everything. The limitation is that it only knows what you give it — it does not search the web — so the output quality is directly proportional to the quality of what you upload.