This plugin is no longer maintained.

[dialedin-webteam]

When I check for updates in Craft CMS, the plugin 'craft-linkfield' indicates that it is no longer maintained, but its features are still working fine. Will this affect my site? If I upgrade to Craft CMS 5, will it still work, and if I deactivate this plugin, will its features still work?

Craft Cms version: 4.10.4
Typed-link-field version: 2.1.5

[nicolas-haemmerli-bh]

You won't be able to upgrade to Craft 5.
But Craft 5.3 has a similar field type included by default.

[RyanRoberts]

and if I deactivate this plugin, will its features still work?

That's unlikely, you'll need to convert it to something else. V1 of the Hyper (a link field) plugin has the ability to migrate from this plugin https://verbb.io/craft-plugins/hyper/docs/v1/guides/migrating-from-typed-link