The two are not competing products, they are complementary. Analytics is where all of your data lives. Google Tag Manager allows you to, quite literally, manage the tags that allow you to collect various bits of information from your site, and port that data into Analytics. Analytics on its own is pretty flat. There are all kinds of charts you can pull up to show all kinds of data that's collected by default, but that default info isn't always the most useful depending on what you're hoping to measure exactly. With GTM you can create all kinds of custom events and conversions which you can track in Analytics so that your data tracking is built for your own unique needs. In my position now, I not only have GA and GTM data to work with, but also HubSpot and Salesforce. All of these have different functions and purposes within our ecosystem, and combined, we can get a full and complete picture of how we're acquiring new business, how much it costs us to acquire new business, and use that data to inform marketing decisions (how and where we want to spend our money to get the best ROI possible). More on reddit.com

It is something web developers use to manage all the trackers and libraries that they use. When you look at certain things or do certain things on a page (move mouse, scroll, some typing and clicks) the developer wants to record that as an event so that they can analyze what users do. Google Analytics, Omniture, Amplitude and a bunch of other systems collect and store these events for different kinds of analysis. Rather than do everything several times (once for each type of analysis they want), they can just use the tag manager and have it sort everything out so it all works neatly. As a user it makes little difference, you are still being watched and tracked as much as ever, just the web page code is cleaner! (I think this is correct but please correct me if I got it wrong - it had been almost a decade since I touched this stuff). More on reddit.com

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Yep, this video from Analytics Mania explains what it is, how it works, and how to set it up. It's a great option for advertisers that don't want to jump through the hoops and pay for server-side tagging, noting this still has some benefits over Google Tag Gateway. I've already set this up for my agency site (took a minute since we already use Cloudflare) and are starting to work with clients to get it implemented. https://www.youtube.com/watch?v=YEUA6d2wieE By the way, most sites should already be using a CDN to improve security, speed, and reliability. More on reddit.com