What's the difference between frictional and structural unemployment?

"Economist talk about frictional unemployment and structural unemployment. Frictional unemployment is more of a job match or job search problem. So it’s a lack of information. Structural unemployment is because of the changing nature of industry within an economy.

An example being people working in textile manufacturing and it’s hard for them to go straight into computer science coding because they don’t have the skills. This is more long term than frictional and in some cases can be quite detrimental to regions and people.”