different between backend vs runtime

backend

backend From the web:

• what backend to use with react
• what backend does facebook use
• what backend language should i learn
• what backend does instagram use
• what backend should i use
• what backend does google use
• what backend does amazon use
• what backend does youtube use

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runtime

runtime From the web:

• what runtime broker
• what runtime error
• what runtime means
• what's runtime environment
• what runtimebroker.exe
• what's runtime systems
• what runtime version
• runtime what does that mean