A single summary of how comfortably your Mac is coping with its current memory load, so you do not have to interpret raw numbers. The detailed breakdown and top RAM apps sit behind it when you want the specifics.
Not by itself - macOS deliberately uses free memory rather than leaving it idle. The app includes memory education for exactly this reason; how much RAM a Mac needs covers the buying decision separately.
Real-time charts are included, with 30-day history and smart alerts available in the Premium tier.
macOS - it is a menu bar app.
You’re browsing inside Instagram, and its built-in browser isn’t allowed to hand links over to the App Store. Open this page in Safari and the link will work.
Tap the three-dot menu at the top right, then choose Open in external browser.