Is It a U or an U?

It’s a U. When pronounced as an individual letter, the vowel "U" has a consonant sound (it sounds like "you"), and takes the article "a".

Is It an SVG or a SVG?

It’s an SVG. Since the abbreviation SVG (Search Engine Optimization) begins with a vowel sound ("ess"), we use the indefinite article "an".

Is It an SEO or a SEO?

It’s an SEO. The abbreviation SEO is usually pronounced as individual letters. Since the consonant "S" begins with a vowel sound ("ess"), we use the article "an".

Is It an SUV or a SUV?

It’s an SUV. Since the first letter (S) begins with a vowel sound ("ess"), we use the indefinite article "an".

Is It an STD or a STD?

It’s an STD. The abbreviation STD is pronounced as separate letters. Since the S starts with a vowel sound ("ess"), it takes the article "an".

Is It an SSD or a SSD?

It's an SSD (Solid-State Drive). The rule for using "a" or "an" is based on pronunciation, not spelling. Since the letter "S" begins with a vowel sound, we use "an" before SSD.

Is It an SMTP or a SMTP?

It's an SMTP (Simple Mail Transfer Protocol). Since the letter "S" begins with a vowel sound, we put "an" before the abbreviation SMTP.

Is It an SMS or a SMS?

It's an SMS (Short Message Service). Since the letter "S" starts with a vowel sound, the abbreviation SMS takes the indefinite article "an".

Is It an SLA or a SLA?

Because the letter "S" begins with a vowel sound, when pronouncing the abbreviation SLA as individual letters, an SLA is correct.