This paper reports on the confinement of nonlinear light-matter interactions to a single wave cycle, demonstrating its utility in time-resolved and strong-field science. The authors use 3.3-femtosecond, 0.72-μm laser pulses with controlled waveforms to ionize atoms near the crests of the central wave cycle, resulting in isolated sub-100-attosecond pulses of extreme ultraviolet (XUV) light. These pulses, containing nearly a nanojoule of energy, emerge with a conversion efficiency of about 10^-6. The technique allows for precise control of electron motion and electron-electron interactions with a resolution approaching the atomic unit of time (~24 as). The study also explores the generation of robust, energetic, isolated sub-100-as XUV pulses using waveform-controlled sub-1.5-cycle near-infrared (NIR) light, and the temporal characterization of these pulses. The results provide ideal conditions for testing models of strong-field control of electron motion and electron-electron interactions, pushing the resolution limit of attosecond spectroscopy to the atomic unit of time.This paper reports on the confinement of nonlinear light-matter interactions to a single wave cycle, demonstrating its utility in time-resolved and strong-field science. The authors use 3.3-femtosecond, 0.72-μm laser pulses with controlled waveforms to ionize atoms near the crests of the central wave cycle, resulting in isolated sub-100-attosecond pulses of extreme ultraviolet (XUV) light. These pulses, containing nearly a nanojoule of energy, emerge with a conversion efficiency of about 10^-6. The technique allows for precise control of electron motion and electron-electron interactions with a resolution approaching the atomic unit of time (~24 as). The study also explores the generation of robust, energetic, isolated sub-100-as XUV pulses using waveform-controlled sub-1.5-cycle near-infrared (NIR) light, and the temporal characterization of these pulses. The results provide ideal conditions for testing models of strong-field control of electron motion and electron-electron interactions, pushing the resolution limit of attosecond spectroscopy to the atomic unit of time.