It supports frame-by-frame animation, tweening, and character rigs, and exports to video, GIF, HTML5 Canvas, and sprite sheets. It integrates with other Adobe apps, so artwork from Illustrator or Photoshop moves in easily.
It was once known for Flash, and the modern product focuses on video and HTML5 output. Animators who want a more traditional workflow sometimes pick Toon Boom Harmony instead.
Adobe sells it by subscription. Moho and Synfig are alternatives. Adobe Animate suits animators who make web and social content.