Every software company is an IT company but every IT company may not be a software company. For example, a hardware company is an IT company but not a software company.

IT (Information Technology) is a catch-all for the industry at present, any job that is primarily to do with the operation of computers or developing for them is within the "IT industry/sector".

However, within the UK at least, job descriptions and adverts tend to reserve "IT" within a job title, as administration, procurement and technical support for company computing resources. Everything from sysadmin work, to front-line technical support, or hardware repair and procurement/policy for internal IT.
Software Engineering specifically means developing software, analysis, design, programming - creating new software, or maintaining/altering existing software.

It is very different to a technical role. The skill set is quite different, technical support guys are not necessarily programmers and (contrary to a lot of non-IT peoples' belief structures) software engineers are not necessarily any good at technical support. Though Software Engineers are within the "IT sector", which confuses the matter slightly in the job market.
 

There is a big difference between IT  and <a href="https://dcastalia.com/">a software company</a>. IT companies provide services such as computer support, network administration and maintenance, and software development. They may also sell hardware and software. On the other hand, software companies develop and sell software applications. The main difference between IT companies and software companies is their focus. IT companies focus on providing services, while software companies focus on developing software. IT companies are usually large companies that provide a wide range of services. They may have a few hundred employees or even a few thousand employees. They usually have a sales force that sells their services to businesses. Software companies are usually smaller than IT companies. They may have a few dozen employees or a few hundred employees. They usually don't have a sales force. Instead, they focus on developing software. Another difference between IT companies and software companies is the type of work they do. IT companies usually provide services such as computer support, network administration and maintenance, and software development. They may also sell hardware and software. On the other hand, software companies develop and sell software applications. One more difference between IT companies and software companies is the way they are structured. IT companies are usually large companies with a hierarchical structure. Software companies are usually smaller and more flat in their structure. The difference between IT companies and software companies is important to understand when looking for a job in either field. IT companies usually require a college degree in computer science or a related field. They also require experience in the field. Software companies may require a college degree, but they also place a strong emphasis on aptitude and skills.