HTC, or High-Tech Computer Corporation, is a Taiwanese consumer electronics company known for its smartphones and other mobile devices. HTC has produced a wide range of smartphones over the years, catering to various market segments and user preferences.

Here are some notable HTC smartphone series and models:

1. HTC One Series: The HTC One series included flagship smartphones known for their premium design, build quality, and innovative features. Models like the HTC One M7, HTC One M8, and HTC One M9 received acclaim for their metal unibody construction, BoomSound speakers, and HTC Sense software experience.
2. HTC Desire Series: The HTC Desire series offered a range of smartphones targeting different price points and user needs. These devices typically featured mid-range specifications and design elements inspired by the flagship HTC One series.
3. HTC U Series: The HTC U series introduced smartphones with a focus on unique design elements and innovative features. Devices like the HTC U11 and HTC U12+ featured pressure-sensitive edges (Edge Sense), liquid surface design, and advanced camera technology.
4. HTC Wildfire Series: The HTC Wildfire series included budget-friendly smartphones aimed at entry-level users. These devices offered essential features and functionality at affordable price points.
5. HTC Evo Series: The HTC Evo series was initially launched in the United States, offering high-end smartphones with large displays, powerful processors, and advanced multimedia capabilities. The HTC Evo 4G was particularly popular for its 4G connectivity and multimedia features.

While HTC smartphones were once popular and respected in the industry, the company has faced challenges in recent years, including declining sales, increased competition, and strategic shifts in focus. As a result, HTC’s presence in the smartphone market has diminished, and the company has shifted its focus to other areas such as virtual reality (with products like the HTC Vive) and enterprise solutions.